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geo t user manual v1.05

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1. RIGHT RIGHT LEFT LEFT FRONT REAR FRONT REAR RIGHT FRONT gt RIGHT REAR LEFT FRONT LEFT REAR 1 1 REAR 06 STEREO 2 2C FRONT LEFT AMPLIFIER le c STEREO EROAA RIGHT AMPLIFIER 1 1 C REAR 2 2 FRONT 62 67 GEO T SERIES PARTS 8 ACCESSORIES LIST 9 GEO T SERIES PARTS amp ACCESSORIES LIST 9 1 Array Modules amp Control Electronics List MODEL DRAWING DESCRIPTION T4805 4x 8 Neodymium 5 Module 6x BLGEOT tee Nf A 12 30 M Ss 8 Neodymium 15 Module 4 BLGEOT CD18 C N CD18 2 18 Carpeted Cardioid CD18 P NC N CD18 2x 18 Painted Cardioid ANX 242 Digital TDcontroller for PS Alpha and Geo series 9 2 Accessories List MODEL DRAWING DESCRIPTION GEOT BUMPER 2 S Main Geo T Bumper 4 BLGEOT 12 35 included GEOT BCCH Compression Mode Geo T Bottom Bumper GEOT KELPBEAM Geo T Kelping Beam SE
2. 59 67 TECHNICAL SPECIFICATIONS 7 5 3 Block Diagram NOLLVINWIS vad puewwog IN3W3ovidsia NOLLVINNIS TANNVHO LNdLNO t OISAHd 41 fa LTANNVHO LAALNO e lis vi AN ME imi son PR la e a t oe ainw Sk 1 E BD evu 4 H Ie st 3 lt Ro NJ lusueoerdsp ENS 3uinivu3diaL dH OISAHd 3univuadwar 41 dui duas 19 M due e010 dwe 100 dsa x pal GD ivo 4 2 Nd od E d NJ jueuecejdsip
3. 9 2 1 Speaker WINING sasa EE 9 2 2 Amplifier Selections ui iiio rec idet Tek ie cn date agetur chauds 10 2 3 Current casser cU c eee cere A e 12 2 4 SS sa A tan p ste ie E ee EE e 12 2 5 cere EET 13 3 NSz1 Sim latiori SOftWare teu LR ett te n eie creta e E 15 4 GEO T rigging procedure ee ie ee Rae e c d i aee die n ge aere de e aSa 16 4 1 SAFETY FIRST db Hr deg Ne mee tpe e D de He ed a a ae adapt dE HE etos 16 4 2 General Descriptiohi e o em ore a epa a e edo has cea dees 18 4 3 Tension Mode SETUP sni a A dev ud eec aie d a ck dee na NEG errans 19 4 4 Compression Mode Full Kelping Beam Setup sse 26 4 5 Compression Mode Half Kelping Beam 33 4 6 Testing and Maintenance of the system 40 5 NEXO NX242 Digital Controller for GEO nennen nnns trennen nns 41 5 1 INX242 Proprietary FUNCIONS esere ntm ete tree ter teo ede teet e eot etg 41 5 2 Gardioid EE angVBE notes eoa tate s dt E 42 5 3 GEO T NX242 Setups description 43 5 4 Trouble shooting titt im C E Aa a 44 5 5 Delays amp System algnMment iie aee n ee t tens bebe nates dere 45 5 6 Driving the CD18s from the AUX send sanan anan anaa anaa anaa anaa anaa aa naa anaa aa ener
4. nnn ennt nnns 46 6 GEO T Tangent Array System Check renna enne nennen arnar 48 6 1 Are the NX242 Digital TDcontrollers properly 48 6 2 Are the amplifiers properly configured aaa aaa anana aaa aana anaa aana anaa anna nennen nnne nnns 48 6 3 Are the amps and the NX properly 48 6 4 Are the speakers properly connected and angled 49 6 5 Final Pre Sound Check 49 7 Technical Specifications aaa a aa ed n D E eR unas egt ua d un 50 7 1 GEO T4805 Vertical Tangent Array Module 50 7 2 GEO T2815 Vertical Tangent Array Module 52 7 3 18 Directional Sub Bass cc oce et Re tette eee td ett e PE Ga esie te 54 7 4 T RIGGING SYSTEM tease acter anas a an isnt 56 7 5 INX242 TDeortroller niece te Eo te tel et e 58 8 Connection diagrams oia de a e a dame et tr M Freenet e Eu oe tannins 60 8 1 GEO T4805 T2815 to amplifiers and NX242 sse arnar 60 8 2 CD18 to amplifiers and 242 61 9 GEOT Series Parts amp Accessories List sanan
5. a ludis yovaTivd IN3W3ovidsia NOLLWINWIS rusis lpuewwoo Z 1 TANNVHO LNd LNO ZOISAHd 41 huuc diesem je 190 sa lt He oD ewe p NJ pd pss z3sN3s E iru 1 09 ova e ainw A 1 us M k NJ Nivo 4 av NOLLVINNIS uowaoejdsp uos oven pansy 3univusdwal LOISAHd 31 I3NNVHO LNdLNO duo jssseuo Je 2 duie 109 so1oA amp due 109 a910 x x zueo E EN D puewwog 1 J E Tu ANVA VIOA
6. equilateral triangles intended to is intended to alert the userto the do not expose this apparatus to rain or mo isture alert the user to the presence of presence of uninsulated dangerous important operating and avoid electrical shock do not remove covers Dangerous voltages exist inside maintenance servicing instructions in the literature accompanying the appliance voltage within the product s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons Refer all servicing to qualified personnel only PLEASE READ CAREFULLY BEFORE PROCEEDING Page 5 67 HIGH SOUND PRESSURE LEVELS Exposure to extremely high noise levels may cause permanent hearing loss Individuals vary considerably in susceptibility to noise induced hearing loss but nearly everyone will lose some hearing if exposed to sufficiently intense noise for a sufficient period of time The U S Government s Occupational and Health Administration OSHA has specified the following permissible noise level exposures Sound Duration Per Day In Hours Sound Level dBA Slow Response 8 90 6 92 4 65 3 97 2 100 1 102 1 105 Vo 110 Va or less 115 According to OSHA any exposure in excess of the above permissible limits could result in some hearing loss Ear plugs or protectors to the ear canals or over the ears must be worn when operating this amplification system in order to prev
7. Page 28 67 GEO T RIGGING PROCEDURE 442 Bumper to fist GEO T4805 assembly 4 push pins BLGEOT12 35 12mm diameter x 35 mm length connect the top GEO T4805 to the bumper IMPORTANT These 4 push pins are slightly longer than the ones used to connect GEO T s 35mm length instead of 30mm Never use the GEO T 12mm x 30mm push pins to connect the top GEO T4805 to the bumper FIRST GEO T4805 TO BUMPER ASSEMBLY e Position the bumper on the first GEO T4805 so that the bumper side slot A is at the rear e Link the GEO T4805 to the bumper using the four 12mm x 35mm push pins provided with the bumper depress the button at the rear of the pin to release the locking mechanism insert the pin fully and release the button e Link the GEO T4805 to the bumper using the four 12mm x 35mm push pins provided with the bumper check that all push pins are in their locked position e Ensure that no objects have been placed accidentally on the top of the bumper as they may fall when the system is lifted 4 4 3 First to second GEOT 4805 In Compression Mode the linking bars must remain inside their respective cabinet side rigging plates Angles between one cabinet and the one below are adjusted using the upper cabinet compression mode setting holes see drawing below e Lift the bumper and top GEO T4805 assembly and position the next GEO T4805 below the assembly e Lower the bumper and top GEO T4805 assembly carefully until the fir
8. 29 537 e 537 mm 21 14 7 2 3 Architects amp Engineers Specifications The 2 full range tangent array module shall have two 8 inch 16 Ohm long excursion neodymium hi flux cone transducers in series two rear passive acoustic resistors and a 1 4 inch exit 16 Ohm neodymium compression driver on a hyperboloid reflective wavesource Coverage shall be configuration dependent in the vertical plane and 120 in the horizontal plane The system shall have a nominal sensitivity of 107dB 105dB wideband When driven by a NEXO NX242 Digital TDcontroller properly connected to amplification capable of delivering 5200 Watts into a 5 Ohm load 6 cabinets per channel in parallel the system shall produce 135dB peak SPL for a single enclosure configuration dependent when arrayed with a frequency response of 85 Hz to 19 kHz 3 dB 77 Hz to 20 kHz 6 dB The system shall have an active crossover with DSP algorithms and a crossover point of 1 3 kHz Electrical connections shall be made via one 6 pole AMPHENOL EP6 socket and one 6 pole AMPHENOL EP6 plug The system shall have a 15 trapezoidal enclosure constructed of 18 ply Baltic birch midsection and aluminium finished in structured black coating and having exterior dimensions no greater than 249mm x 908mm W x 537mm D 9 13 16 in x 35 1 2 in 21 1 8 in D the system shall weigh 29kg 63 9 16 Exterior hardware shall include a
9. check your amplifier user manual for proper connection of outputs 1 and 2 in relation to input phase e recommends Bridge Mono Mode for LF Rear and LF MF Front sections when paralleling 6 GEOT series modules 1 x 6 LF rear per amplifier 1 x 6 LF MF front per amplifier Parallel mono the output terminals of the two channels are configured in parallel using an internal relay The single load is connected either to the output of channel 1 or to that of channel 2 as if in stereo While the total output of the amplifier remains the same the output voltage level is also the same as in stereo mode The minimum impedance that can be connected is reduced by half due to the fact that current capability is doubled Typically only channel 1 input is active e does not recommend Parallel Mono Mode for any GEO T or CD18 amplification 243 Advanced protection Some high end amplifiers may include signal processing functions similar to those found in the NX242 TDcontroller loudspeaker offset integration limiter compressor etc Moreover when this processing is digital computation latency time can introduce a few milliseconds delay from input to output These functions are not adapted to specific system requirements and may interfere with the complex protection algorithms used in the NX242 NEXO do not advise using other protection systems in conjunction with the NX242 and they should be disabled IMPORTANT For pro
10. 30mm Never use the GEO T 12mm x 30mm push pins to connect the top GEO T4805 to the bumper FIRST GEO T4805 TO BUMPER ASSEMBLY e Position the bumper on the first GEO T4805 so that the bumper side slot A is at the rear e Link the GEO T4805 to the bumper using the four 12mm x 35mm push pins provided with the bumper depress the button at the rear of the pin to release the locking mechanism insert the pin fully and release the button e Link the GEO T4805 to the bumper using the four 12mm x 35mm push pins provided with the bumper check that all push pins are in their locked position e Ensure that no objects have been placed accidentally on the top of the bumper as they may fall when the system is lifted 36 67 GEO T RIGGING PROCEDURE 4 5 3 First to second GEOT 4805 In Compression Mode the linking bars must remain inside their respective cabinet side rigging plates Angles between one cabinet and the one below are adjusted using the upper cabinet compression mode setting holes see drawing below Lift the bumper and top GEO T4805 assembly and position the next GEO T4805 below the assembly Lower the bumper and top GEO T4805 assembly carefully until the first and second GEO T4805 side rigging plates locate Use front flanges and side vent ports to guide the assembly The rigging plates have been designed to locate against each other and so align the holes correctly e Fix the two GEO T4805 by inse
11. 8 inch long excursion neodymium cone transducers gt R C25 5 L NX241 TDcontroller Partial BLOCK DIAGRAM e Output 3 drives the HF 3 inch voice coil 1 4 inch exit neodymium compression driver Command displacement Command Output 4 is not used HF TEMPERATURE PEAK SIMULATION DISPLACEMENT 1 Signal POWER INPUT VU METER INPUT VU METER AD F FALLBACK AD AMP VOLTAGEAMP GAIN T AD EQ SHELVINGI GG SENSE 1 INPUT R INPUT L Page 44 67 NX242 DIGITAL CONTROLLER FOR T 5 3 3 CD18 Hardware configuration e Input L R or L R can be selected in MENU 3 2 e Output 1 drives the rear firing 18 inch transducer of the left CD18 s e Output 2 drives the front firing 18 inch transducer of the left CD18 s e Output 3 drives the rear firing 18 inch transducer of the right CD18 s e Output 4 drives the front firing 18 inch transducer of the right CD18 s Setups Please refer to the latest versions of the NX242 user manual and firmware www NEXO sa com 5 4 Trouble shooting The NX242 has been designed to be user friendly However with highly technical systems such as the GEO T amp CD18 incorrect adjustment of
12. CD12 GEO T4805 LF and CD18 dispersion are digitally set to a cardioid pattern by adjusting the front and rear 8 loudspeakers phase and amplitude relationship Maximum attenuation is achieved at 180 average rear to front attenuation is more than 12 dB GEO T2815 low frequency directional behaviour is achieved by using rear radiating acoustic resistor These are designed so that LF dispersion is cardioid Maximum attenuation is achieved at 180 average rear to front attenuation is more than 12 dB OUTPUT CHANNEL 4 gt Ea MONIS MUTE DAC Gain2 5 3 GEO T NX242 Setups description 5 3 1 GEO T4805 Hardware configuration e can be selected the MENU 3 2 L R or L R e Output 1 drives the rear firing LF 8 inch long excursion neodymium cone transducers 7 gt e Output 2 drives the front firing LF MF 8 inch E long excursion neodymium cone transducers 8 e Output 3 drives the HF 3 inch voice coil 1 4 inch exit neodymium compression driver o3 z EE 5 T 8 e Output 4 is not used 88 EE Setups Please refer to the latest version of the NX242 user manual and firmware www NEXO sa com 5 3 2 GEO T2815 Hardware configuration e can be selected in the MENU 3 2 L or L R TE e Output 1 is not used e Output 2 drives the LF MF
13. GEO T2815 cabinets e Connect the speaker links e Check the array according to the Checklist procedure GEO T RIGGING PROCEDURE Page 31 67 4 4 7 Applying compression e With the cluster raised 1 meter 3feet off the ground lower the rear motor hoist only The array will swing slowly forwards until the centre of gravity lies directly below the front motor hoist Continue to lower the rear motor hoist and the rear articulated part of the Kelping Beam will swing downwards towards the cabinets Stop the hoist when the rear arm of the Kelping Beam reaches an elevation of approximately 70 degrees The angle is approximate and is not critical to the final angle of the array IMPORTANT When lowering rear motor hoist the cluster swings forward ensure there is no obstacle in front of the cluster within sufficient distance e Attach the lower hook of the Kelping Chain Link to the rear of the Bottom Bumper using a 3 4 Shackle e Manually raise the Bottom Bumper until it is approximately parallel with the ground and set the adjustable clutch in the Kelping Chain Link so that the chain is taught e Make a final check that the Kelping Link Chain is correctly installed and store the surplus chain in the chain bag supplied The chain bag should be clipped to the clutch adjuster assembly e The rear motor hoist may now be raised to apply the pull up force to the bottom of the array Notice that as the rear hoist is raised the cabinets in the
14. Inverting polarity on one channel should always result in a massive difference near the crossover point If the sound is more or less the same the system is no longer aligned Page 48 67 GEO TANGENT ARRAY SYSTEM CHECK LIST 6 GEOT TANGENT ARRAY SYSTEM CHECK LIST It is essential to execute all these check steps prior to perform a sound check on the front end to the system Following this checklist step by step will prevent many troubles and will save time in the end 6 1 Are the NX242 Digital TDcontrollers properly configured IMPORTANT If you must change any of the parameters listed above make sure that you use the same values on all NX242 s 6 1 1 NX242 Load 2 13 and below Freq Band Gain Global Gain Amp Power Delay Sense Gain Array EQ Headroom HF 32 dB OdB 1350 Watts Oms 0 dB 0 dB 5 bars LF rear 32dB 2600 Watts 0 ms 0 dB 0 dB 5 bars front 0dB 2600 Watts 0 0 dB 0 dB 5 bars CD18 Sub 26dB 2000 Watts 0 ms 0 dB 0 dB 5 bars 6 1 2 NX242 Load 2 14 and above Freq Band Gain Global Gain Amp Power Delay Sense Gain Array EQ Headroom HF 26dB 1350 Watts 0 ms 0 dB 0 dB 5 bars LF rear 32dB 2600 Watts 0 ms 0 dB 0 dB 5 bars MF LF front 32dB 0dB 2600 Watts 0 ms 0 dB 0 dB 5 bars CD18 Sub 26dB 2000 Watts 0 ms 0 dB 0 dB 5 bars 6 2 Arethe amplifi
15. System could lead to dangerous consequences Used and maintained correctly the GEOT CD18 Rigging System will give many years of reliable service in portable systems Please take the time to read and understand this manual Always use NS 1 to determine the optimum angle settings for a particular venue hang point and curved vertical GEOT CD18 array Applied forces and moments are strongly cabinet quantity and angle configuration dependent Cluster configuration must be implemented and validated in NS 1 prior to installation 411 Flown Systems Safety e Always inspect all the rigging components and cabinets for damage before assembly special attention to the lifting points and safety clips If you suspect that any of the components are damaged or defective DO NOT USE THE AFFECTED PARTS Contact your supplier for replacements e Read this manual carefully Also be familiar with the manuals and safe working procedures for any ancillary equipment that will be used with the GEOT CD18 Rigging System e Applied forces and moments are strongly cabinet quantity and angle configuration dependent Cluster configuration must be implemented and validated in NS 1 prior to installation e Ensure that all local and National regulations regarding the safety and operation of flying equipment are understood and adhered to Information on these regulations can usually be obtained from Local Government Offices e When deploying a CD18 sys
16. anan anaa nenna nitentes 62 9 1 Array Modules amp Control Electronics List ener nennen 62 9 2 Accessories ce ED pd ede Dg He Re 62 10 Recommended installation tools and equipment sse nennen 64 11 USER NOTES iis etie nuditate e ears hte atta ga er a Ga aaa 65 INTRODUCTION Page 7 67 1 INTRODUCTION Thank you for selecting NEXO GEO T Series Tangent Array System This manual is intended to provide you with necessary and useful information about your GEO System which includes the following products e 14805 5 Tangent Array Module 4x 8 20cm Neodymium Hi flux 16 Ohm LF Drivers two forward facing LF MF two rear SS 8 facing LF and one 3 voice coil 1 4 Throat S Neodymium 16 Ohm HF Driver with 5 A gd Hyperboloid Reflective Wavesource The A main building block for curved vertical tangent arrays 12805 15 Tangent Array Module 2 x 8 20cm Neodymium Hi flux 16 Ohm LF Drivers forward facing LF MF 2 x rear passive acoustic resistance radiator and a 3 voice coil 1 4 Throat Neodymium 16 Ohm HF Driver with a 15 Hyperboloid Reflective Wavesource The near field building block for curved vertical tangent arrays e CD18 Cardioid Dipole Sub bass Two 18 45cm Long Excursion Neodymium 6 Ohm Drivers each controlled by one DSP channel producing a 110 x 110 Super Cardioid pattern Can be used in f
17. array close together to the angles set by the linking bar adjustments e When all of the cabinets are closed together the array begins to move as a whole This is the indication that the angles have been correctly set Ensure that the rear arm and the main member of the Kelping Beam remain at an angle 20 with respect to each other indicating that the pull up force will remain constantly applied IMPORTANT DO NOT attempt to make any changes to the linking bars when the rear pull up force is applied m oe D Page 32 67 GEO T RIGGING PROCEDURE 4 4 8 Positioning the cluster e Adjust the overall height and aiming angle of the array by adjusting the front and rear motor hoists accordingly Note that the accuracy of the angle and height of the array are critical and the appropriate measurement tools are necessary to achieve this see the appendix for a recommended list of installation tools e Install a secondary safety steel between the Kelping Beam and a suitable point in the supporting structure IMPORTANT The requirements for secondary safety systems vary with territories However the secondary safety steel MUST have a SWL equivalent to or greater than that of the rigging system 449 De rigging and loading out Taking the system down is just a case of doing the reverse procedure to flying the array However there are some important factors to conside
18. av ova enm e e H e x lt ed z NJ INSNSOVIASIG WALBIN NA TLNdNI A H M av Jr 9 omas ved enBojeuy INVHOVIG 490 19 121014 0941 peXN Page 60 67 CONNECTION DIAGRAMS 8 CONNECTION DIAGRAMS 8 1 GEO T4805 T2815 to amplifiers and NX242 FROM AMPLIFIERS HF LF MF LF FRONT REAR 1 2 REAR LF 3 4 FRONT LF MF 5 6 HF 6 HF AMPLIFIER e le BRIDGED RONT LF MF AMPLIFIER MONO e BRIDGED EAR LF AMPLIFIER 1 BRIDGED jo RONT LF MF AMPLIFIER 2 MONO o GS BRIDGED REAR LF AMPLIFIER 2 MONO 8 2 CONNECTION DIAGRAMS FROM AMPLIFIERS CD18 to amplifiers and NX242 Page 61 67 TO AMPLIFIERS
19. cluster weight For arrays of 6 to 18 cabinets 1 tonne motor hoists are sufficient Arrays of 18 cabinets and above should be supported with 2 tons capacity motor hoists IMPORTANT The front motor hoist must be positioned so that there is enough space in front of the future cluster location to allow the cluster to swing forward without obstruction GEO T RIGGING PROCEDURE Page 27 67 441 Kelping beam to bumper e Link the motor hoists to the Kelping Beam using the front upper axis fixed beam and rear upper axis articulated beam and ensure that these axes are properly locked with the R clips supplied e the Kelping Beam and position the bumper below it Lower the Kelping beam so that the front beam load pin holes are aligned with the bumper load pin holes see drawing o e p p 7 N V p oe ak NG E A 7 A baa C o 5 FRONT KELPING BEAM TO BUMPER SETUP Connect the Kelping Beam to the bumper with the two axes through the corresponding holes see drawing above and ensure that these are properly locked with the R clips e Attach one end of the GEO T Kelping Chain to the Kelping Beam rear lower axis e the GEO T Kelping chain has a clutch assembly 0 5 meter from one end This is the end that connects to the bottom GEO T4805 and a small bag is provided for excess chain ATTACHING THE GEO T KELPING CHAIN TO THE KELPING BEAM
20. constant sensitivity settings will give a different gain value when the amplifier power is different NEXO recommends low gain amplifiers 26dB is recommended as it is at the same time adequately low and quite common amongst amplifier manufacturers This gain setting improves signal to noise ratio and allows all preceding electronic equipment including the NX242 TDcontroller to operate at optimum level Remember that using a high gain amplifier will raise the noise floor proportionally GEO T GENERAL SET UP INSTRUCTIONS Page 13 67 2 4 2 Operating Mode Most two channel amplifiers available on the pro audio market have the following operating modes e Stereo two fully independent channels deliver identical power into identical loads e NEXO recommends Stereo Mode for HF sections when paralleling 6 GEO T series modules 2 x 6 HF per amplifier and for CD18 amplification Bridge Mono the second signal channel processes the same input as the first channel but with reversed phase The single load is connected between the two positive channel outputs using a suitable connection While the total output of the amplifier remains the same the available output voltage the minimum impedance that can be connected and the voltage gain are doubled as compared with stereo operation Typically only channel 1 input is active Positive and negative output connections vary depending on amplifier manufacturers IMPORTANT When in Bridge Mono mode
21. gain on the channels connected to mono bridged amplifiers If this value is not set properly the TDcontroller will not be able to protect your system properly The second line of the MENU2 6 displays the gain as seen by the NX242 to ease the setting of this parameter 5 4 4 Gains If your amplifier gains are not the same on each channel you will have to adjust the inter channel gain in order to compensate for this amplifier gain difference 5 4 5 Delays Multiple NX242 s can be used on a single GEO T array When changing the delay in one NX242 TDcontroller that is part of a multi controller system take great care to have exactly the same delay setting in all NX242 TDcontrollers that receive the same input signal i e all NX242 s that are fed from the Left output of the mixing console should have the same delay settings A Tangent Array is very sensitive to delay differences between sections of the array in the same line You could experience coverage problems if all delays applied to a Tangent Array are not equal NX242 DIGITAL CONTROLLER FOR GEO T Page 45 67 Please refer to the chapter in the NX242 User Manual on setting delay for proper time alignment between GEO T Series and CD18 5 4 6 Reversed Cardioid Pattern Polarity checks are often performed while the system is being set up Keep in mind that cardioid speakers may also require a coverage test If you invert two outputs of the NX242 you could have the main lobe inverted
22. must be rated to support the entire cluster weight For arrays of 6 to 18 cabinets 1 tonne motor hoists are sufficient Arrays of 18 cabinets and above should be supported with 2 tons capacity motor hoists 4 5 1 Front Kelping beam to bumper e Disconnect Rear Beam from Front Beam by removing connecting axis Store Rear Beam e Link the motor hoists to the Kelping Beam using front and rear upper axis fixed beam and ensure that these axes are properly locked with the R clips supplied the Kelping Beam and position the bumper below it e Lower the Kelping beam so that the front beam load pin holes are aligned with the bumper load pin holes see drawing KELPING BEAM TO BUMPER SETUP Connect the Kelping Beam to the bumper with the two axes through the corresponding holes see drawing above and ensure that these are properly locked with the clips e Attach theChain Lever Hoist LEVA1500 chain hook to the Kelping Beam rear lower axis see drawing below e the Chain Lever Hoist LEVA1500 connects to the bottom GEO T4805 and a small bag is provided for excess chain GEO T RIGGING PROCEDURE Page 35 67 ATTACHING THE LEVA1500 CHAIN TO THE KELPING BEAM 452 Bumper to fist GEO T4805 assembly 4 push pins BLGEOT12 35 12mm diameter x 35 mm length connect the top GEO T4805 to the bumper IMPORTANT These 4 push pins are slightly longer than the ones used to connect GEO T s 35mm length instead of
23. the NX242 can lower the quality amp safety of your system Listed below are the most common errors encountered by NEXO Technical Support 5 4 1 Operation of Multiple TDcontrollers Typically GEO T CD18 systems require a minimum of two NX242 s per side one NX242 for GEO T s another for the CD18 s Eventually two or more NX242 s will operate within the same GEO T cluster It is mandatory to verify the consistency of the setups and adjustment between processors to avoid the problems described below IMPORTANT When using multiple NX242 s in a single array all parameters should be identical and set to proper values 5 4 2 Amplifier Power MENU 2 7 If the amplifier power MENU 2 7 is set to a value below the amplifer s actual power the peak limiter of the NX242 will trigger continually creating audible distortion Please note that this peak limiter is not set to act as a compressor on the signal It is intended to minimize the clipping of the amplifier by operating slightly after the amplifier s clipping point One way to properly adjust this parameter is to set amplifier power at maximum B000W and decrease the value until the amplifier and TDcontroller clip at the same time 5 4 3 Amplifier Gain MENU 2 6 It is very important to check the gain of each channel When all amplifier gain switches are set to identical gain and LF rear and LF MF front amplifier operate in bridge mono mode you must remember to add to the normal
24. 05 to a height that allows convenient access to the linking bars and angle setting holes The top T4805 s linking bars must be rotated downwards and into the lower GEO T4805 s side rigging plate see drawing One operator must then lift the rear of the bottom GEO T while the angle settings push pins are inserted by the second operator on each side of the cabinet Once the angle setting push pins are inserted lower the rear of the lower T the angle between the two GEO T4805 s is now correct Check that all push pins are locked and that angle settings are identical on both sides FIRST GEO T4805 SECOND GEO T4805 ASSEMBLY GEO T RIGGING PROCEDURE Page 23 67 4 3 4 Subsequent GEO T4805 s e Repeat the above section steps until you have positioned six GEO T4805 s e Fix the speaker cable to the bumper and connect it to the top GEO T4805 e Connect the five speaker links e Check the six cabinets according to the Checklist procedure described in the following section IMPORTANT Tension Mode DO NOT attempt to make any changes to the linking bars while the system is in tension or while it is being lifted or lowered DO NOT attempt to correct any angle mistakes without removing the tension load from the system For small arrays this can be achieved by carefully landing the array and allowing the cabinets to close together supported from above by the motor hoist Take care during this procedure to kee
25. 1 3 kHz active Nominal impedance HF 16 Ohm LF MF front 32 Ohm LF rear 32 Ohm Recommended amplifiers 2700 Watts into 3 Ohm 6 cabinets parallel per amp channel front 5200 Watts into 6 Ohm 6 cabinets parallel per bridged mono amp LF rear section 5200 Watts into 6 Ohm 6 cabinets parallel per bridged mono amp SYSTEM OPERATION Electronic controller The NX242 Digital TDcontroller presets are precisely matched to the GEO T Series cabinets and include sophisticated protection systems as well as advanced cardioid directivity DSP algorithms Using GEO T Series cabinets without a properly connected NX242 will result in poor sound quality and can damage components Array design Arrays of less than 6 x GEO T4805 will provide poor dispersion control and are neither recommended nor supported Sub bass CD18 directional sub extends system low frequency response down to 25 Hz Speaker cables HF wired 5 6 front section wired 3 4 LF rear section wired 1 2 Rigging System Please refer to the GEO user manual before any operation As part of a policy of continual improvement NEXO reserves the right to change specifications without notice a Response curves and data anechoic far field above 200 Hz half space anechoic below 200 Hz b Sensitivity amp peak SPL will depend on spectral distribution Measured with band limited pink noise Refers to the specified 3 dB range Data are for speaker pr
26. 25 of phase shift NX242 DIGITAL CONTROLLER FOR GEO T Page 47 67 Should you want to restrict the bandwidth with a low pass filter you can introduce a phase difference of up to 180 completely out of phase at the cross over point If the signal is passing though any digital equipment you are adding between 1 4ms and 2 2ms around 70 phase shift at 100Hz due solely to the converter delay The additional delay due to the processing itself look ahead compressor delay can be quite important as well If both outputs are not measured in the actual configuration it is very likely that phase alignment will not be correct 5 6 3 Consequences of badly aligned systems Mis aligned systems have lower efficiency i e for the same SPL you would be obliged to drive the system harder activating the displacement amp temperature protection at lower output levels Both sound quality and reliability will decrease as the system is stressed In certain situations you will even need more speakers to do the same job 5 6 4 Precautions 8 Checks Before using the AUX send of your desk ensure that the outputs are in phase you can feed 1000Hz signal at the input and monitor the MAIN and AUX outputs on a dual trace oscilloscope Always apply EQ or processing on both channels at once so that the phase relationship will not be altered Never add additional low pass filtering on the SUB or high pass filtering on the main system
27. 3 x 537 mm 9 13 16 x 35 1 2 x 21 1 8 including array assembly system Shape 15 Trapezoid Weight net 29 kg 63 9 6 including array assembly system Connectors 1 x AMPHENOL EP6 6 pole socket In 1 AMPHENOL AP6 6 pole connector Through Construction Main structure Baltic birch ply with structured black coating Rear section Aluminum with dark grey coating Front finish Injected polyurethane flange metallic gray coating structured black on request Flying points Integral flying system Intercabinet angle adjustments 6 30 8 00 10 0 12 5 15 logarithmic steps SYSTEM SPECIFICATIONS GEO T2815 with NX242 TDcontroller Frequency response 85 Hz 19 kHz 3 dB Usable range 6 a 77 Hz 20 kHz Sensitivity 1W 1m b 107 dB SPL nominal 105 dB SPL wideband Peak SPL 1m b Configuration dependent d Dispersion c Vertical plane Configuration dependent d Horizontal plane 120 Low Frequency cardioid Crossover frequencies LF MF HF 1 3 kHz active Nominal impedance HF 16 Ohm LF MF 32 Ohm Recommended amplifiers 2700 Watts into 3 Ohm 6 cabinets parallel per amp channel MF LF 5200 Watts into 6 Ohm 6 cabinets parallel per bridged mono amp SYSTEM OPERATION Electronic controller The NX242 Digital TDcontroller presets are precisely matched to the GEO T Series cabinets and include sophisticated protection systems as well as advanced cardioid directivity DSP algori
28. L achievable with the same amplifier Active equalisation can also extend a NEXO loudspeaker s frequency response especially at low frequencies where acoustical performance is limited by cabinet size While many DSP processors can provide this type of EQ none can include the extensive measurement facilities and listening tests employed by NEXO R amp D when adjusting NX242 setups for a particular loudspeaker Crossover section Crossover between different bands is tuned for every set up of every cabinet The crossover is designed to ensure the best phase alignment possible throughout the crossover overlap region Each crossover is made to measure in order that each transducer can fit with its neighbour by achieving a perfect phase alignment Unconventional filters are used ranging from 6dB octave to near infinite slopes depending of the type of crossover wanted Time alignment is also performed in an unconventional way by using the crossover filter group delays in combination with allpass and or frequency dependent delays 5 1 3 Protection VCAs and VCEQs Each channel has its own simulation and protection process Each audio channel contains a combination of controlled gain stages let s call them VCAs as in analogue circuitry These VCAs are embedded into complex composite signal chains that adapt change their basic operation into frequency selective attenuation similar to an analog voltage controlled dynamic equaliser VCEQ Pa
29. NEXO J GEO T Series T4805 5 Tangent Array Module T2815 15 Tangent Array Module CD18 Directional Sub bass SS 2 User Manual GEO T Series User Manual V1 05 Date 05 10 2010 Page 2 67 PLEASE READ CAREFULLY BEFORE PROCEEDING GEO Technology is radically new thinking The GEO R amp D Project has to date resulted in the following patent applications e The GEO Hyperboloid Reflective Wavesource differs radically from the megaphone variant type horns you know and love or hate Tried and true methods will produce entirely unexpected results HRW technology produces precise and predictable results e The Configurable Directivity Flange A waveguide that allows the operator to alter its behaviour An unprecedented NEXO development that is easy to use once you know how and when e Directivity Phase Device needs no operator input to function but it is reassuring to know that the coupling of the midrange of the system is considered as important as the high frequencies e GEO s DSP driven Cardioid Dipolar Sub bass devices are a new approach to controlling LF VLF acoustic energy GEO is not hard to use when you understand how The technology behind GEO is revolutionary but it is grounded in years of practical experience with the problems of delivering high quality professional sound to large audiences at high SPL levels The GEO toolbox includes GEOSoft a simple yet powerful and highly predictiv
30. RIES PARTS amp ACCESSORIES LIST Page 63 67 MODEL DRAWING DESCRIPTION LEVA1500 Chain Lever Hoist 1 5 tonne 9 meters chain GEOT RAINCO Geo T Waterproof Back Cover up to 6 cabinets GEOT BPRAINCO Bumper Waterproof Back Cover CD18 WB CD 18 WheelBoard BLGEOT12 30 9 NN JI GEO T 12mm x 30mm Quick Release Pin BLGEOT12 35 GEO T Bumper 12mm x 35mm Quick Release Pin GEOT CABLE 1m Linking Cable For Geo T4805 T2815 GEOT 613F AAN V Female Connector GEOT 612M AP6 Male Connector Page 64 67 RECOMMENDED INSTALLATION TOOLS AND EQUIPMENT 10 RECOMMENDED INSTALLATION TOOLS AND EQUIPMENT e Tape measure should be 30m 100ft in length and be of durable fibre material Have one per array available to speed up the installation process Laser inclinometer For measuring vertical and horizontal angles in the venue An ideal product is the Calpac Laser projecting a dot version which costs approximately 60 e Spirit level used to ascertain the trueness of the surface from which the angle measurements originate e Rangefinder measuring device either a Disto type laser measure or an optical laser rangefinder can be used Devices such as the Bushnell Yardage Pro sports rangefinders provide sufficiently accuracy and are easy to use They have the additional advantage of working very well in bright sunlight e Electronic calculator with trigonometric functions to
31. Supply FEATURES Audio Inputs Sense Inputs Audio Outputs Processing Front Panel FLASH EPROM Rear Panel Dimensions amp Weight NX242 Digital TDcontroller 28 dBu Max into 600 Ohm load Channels 1 amp 2 99 dBu Channel 3 amp 4 typical 107 dBu Flat without gain scaling 101dBu lt 0 02 flat setup max0 04 for Output 27 5dBu 1 4ms on a flat setup 115 230 Volts 50 60 Hz operating range 90 125V amp 180 264V 2 Audio Inputs 24 bit converters Electronically Balanced 36 k Ohm 2 XLR 3F Connectors 4 Amplifier Sense Inputs LF mono MF HF L amp R Floating 150 kQ 18 bit converters 8 Pole Removable Strip Terminal 4 Audio Outputs 24 bit converters Electronically balanced 50 Ohm 4 XLR 3M connectors 24 bit data with 48 bit accumulator 100MIPS Optional Expansion Board 300MIPS Menu A and Menu B buttons 16 characters by 2 lines display Select Wheel amp Enter button 4 gt IN Clip DSP Clip red LED s Speaker Protection yellow LED for each channel Individual Mute Solo buttons and red LED for each channel Amp Sense 8 Peak green amp red LED s for each channel Software updates upgrades new system setups available on www nexo sa com 90 240 V Fuse holder RS232 connector for serial com Empty slot for extension card communication amp processing power 1U 19 Rack 230 mm 9 Depth 4kg 7 5 2 Front and Rear Panel view
32. TRUCTIONS 2 1 Speaker Wiring 2 1 1 GEO T4805 8 T2815 connectors GEO T s are connected to power amplifiers via one AP6 Male Connector GEOT 612M on a link cable that is stowed in the rear vent port One EP6 Female Chassis GEOT 613F on the back connector panel is used as output to feed the next GEO T A wiring diagram is printed on the connection panel located on the back of each cabinet The EP6 AP6 connectors are linked in parallel within the enclosures see the Connections Diagrams section of this manual EP6 AP6 Pin 1 2 3 4 5 6 GEO T4805 Rear 8 LF 32 Q Front 8 LF MF 32 Q 1 4 HF 16 Q 1 Negative 2 Positive 3 Negative 4 Positive 5 Negative 6 Positive T2815 Not connected Front 8 LF MF 32 Q 14 HF 16 Q Through 3 Negative 4 Positive 5 Negative 6 Positive IMPORTANT NEVER USE a male connector to feed the signal High voltages and currents are delivered from the amplifiers to the GEO T system MADE IN FRANCE GEO T4805 REAR CONNECTOR PANEL GEO T2815 REAR CONNECTOR PANEL Page 10 67 GEO T GENERAL SET UP INSTRUCTIONS 2 1 2 CD18 connectors The CD18 are connected to power amplifiers NLAFC SPEAKON connectors not supplied A wiring diagram is printed on the connection panel located on the back of each cabinet The in out pins of the SPEAKON sockets are identified The sockets are connected in parallel within the enclosures see the Conne
33. active to reduce the NX242 s output signal level until the effective temperature falls below the maximum usable value In order to avoid detrimental effects induced by very long release time constants produced by the temperature detection signal system output being reduced for an extended period pumping effects etc the detection signal is modulated by another voltage integrated with faster time constants that match the subjective perception of sound level This allows the controller to reduce the effective operating duration of the temperature limiter and make it sound more natural while the efficiency of protection is fully preserved and protection thresholds are kept as high as possible Physiologic Dynamic Control The Physiologic Dynamic Control is intended to avoid unwanted effects produced by long attack time constants By anticipating the operation of the temperature limiter it prevents a high level audio signal appearing suddenly then being kept up for long enough to trigger the temperature limiter Without this a rough and delayed gain variation would result that would be quite noticeable and unnatural The Physio control voltage acts independently on the VCA with its operation threshold slightly 3 dB above that of the temperature limiter and a low compression ratio its optimised attack time constant allows it to start operating without any subjectively unpleasant transient effects Peak Limiter The peak limiter primary func
34. al areas When arrays use conventional horns the lack of precision overlap and interference masks errors in array design and aiming The highly precise GEO wavesource responds accurately consistently and predictably to the design and deployment of a curved vertical tangent array This is why the GEO rigging system is designed to control angular splay to 0 01 precision GEO curved vertical tangent arrays require different operational techniques Over the years system designers and operators have developed a number of signal processing techniques to disguise and partly overcome the limitations of horn design Frequency shading amplitude shading system tuning all of these are tools of the advanced sound system operator NONE OF THESE TECHNIQUES ARE APPLICABLE TO GEO TANGENT ARRAYS Instead of enhancing the array s performance they will severely degrade it Take time to learn how to get great results with GEO Technology It is an investment that will pay off in more satisfied clients more efficient operating procedures and more recognition for your skill as a sound system designer and operator A comprehensive understanding of GEO theory tangent arrays and specific features of the GEO T Series will help you to operate your system at its full potential PLEASE READ CAREFULLY BEFORE PROCEEDING Page 3 67 PLEASE READ CAREFULLY BEFORE PROCEEDING BASIC PRECAUTIONS Do not open the speaker system or attempt to disassemble
35. and firing to the rear It may be quite hard to detect a reversed cardioid pattern when it involves one section of a large array A good practice is to test the each cabinet in the array with the front speakers only The system is then omni directional Then turn on the back speaker you should notice a massive reduction at the back and additional level at the front This test must be done in addition to the usual polarity test 5 4 7 Using the wrong NX242 setups for a given cabinet Each NX242 setup is tailored for a certain NEXO loudspeaker Using the wrong setup will create safety and quality problems Always check that every cabinet in your system is being driven by the correct NX242 setup 5 4 8 Connections To ensure correct electronic behaviour and to guarantee specifications and EMC performance a NX242 must be properly wired Always use balanced connectors with the shield connected to pin 1 on both sides For more wiring recommendations please refer to the application note in the NX242 manual update 5 5 Delays amp System alignment 5 5 1 Description The NX242 s factory delay presets are optimised to provide the best possible crossover between the GEO T and CD18 systems The reference point for this adjustment is the front of each cabinet This means that the internal delays needed to achieve a correct time alignment are set for cabinets standing next to each other with both fronts aligned We recommend that the system i
36. block any ventilation openings Install in accordance with the manufacturer s instructions Do not install near any heat sources such as radiators heat registers stoves or other apparatus including amplifiers that produce heat Do not defeat the safety purpose of the polarized or grounding type plug A polarized plug has two blades with one wider than the other A grounding type plug has two blades and a third grounding prong The wide blade or the third prong are provided for your safety If the provided plug does not fit into your outlet consult an electrician for replacement of the obsolete outlet US market Protect the power cord from being walked on or pinched particularly at plugs convenience receptacles and the point where they exit from the apparatus Only use attachments accessories specified by the manufacturer Unplug this apparatus during lightning storms or when unused for long periods of time Refer all servicing to qualified service personnel Servicing is required when the apparatus has been damaged in any way such as power supply cord or plug is damaged liquid has been spilled or objects have fallen into the apparatus the apparatus has been exposed to rain or moisture does not operate normally or has been dropped CAUTION DO NOT OPEN The lightning flash with arrowhead H The exclamation point within an symbol within an equilateral triangie WARNING To reduce the risk of fire or electric shock
37. calculate the height from ground level to points in the room The formula to calculate height of a point from measured angle and distance is e Height of point Sin vertical angle in degrees x distance to point e NB Take care when using spreadsheets as they calculate using radians by default To convert degrees to radians use the formula e Angle in radians 3 142 x Angle in degrees 180 e Computer Laptop or Desktop PC running Windows 95 98 2000 or XP with the current version of NEXO GeoSoft installed It is not possible to configure a Geo tangent array properly without using GeoSoft Note that when GeoSoft designs are prepared prior to arrival at the venue it is often necessary to modify or update the design to accommodate special circumstances A PC is absolutely essential to make such changes e Digital remote inclinometer with a remote sensor in the bumper and a meter unit at ground level to ensure precise installation of the cluster A typical unit for this purpose is the Schaevitz Anglestar which typically costs around 350 for a sensor and meter unit pair At greater cost but with very high precision is the NEXO GeoSight system that predicts the stationary angle of the array even while it is swinging and has a green laser mounted coincident to and parallel with the axis of the topmost cabinet e Audio Analysis Software recommended but not absolutely essential programs such as SIA Smaart Pro or Spectrafoo enable rapi
38. ch a cluster IMPORTANT Former NX241 TDcontroller GEO T presets Gain structure has changed from load 2 13 to load 2 14 e Loads 2 13 and below the NX242 expects all amplifiers to have the same overall gain add 6 dB gain to the HF section to compensate for LF rear and LF MF rear sections bridge operating mode 6 dB gain Loads 2 14 and above all amplifier gain switches should be set at 26 dB as in the example above the NX242 compensates for the bridge operating mode 6 dB voltage gain on LF rear and LF MF front sections NS 1 SIMULATION SOFTWARE Page 15 67 3 NS 1 SIMULATION SOFTWARE NS 1 software is a R amp D simulation tool derived application It processes measured speaker data with complex mathematical algorithms to assist the user in optimizing system design Due to the complexity of the interaction of multiple cabinets it is simply not possible to reliably design curved vertical arrays without using the processing power of a computer to predict the optimum array structure for a given audience geometry The design logic is far more complex than looking at a section drawing of the venue measuring the overall angle needed to cover the audience from the cluster location and dividing by 5 degrees to determine the required amount number of GEO T4805 cabinets NS 1 is an easy to use tool that allows to shape the energy leaving the cluster to fit the audience It predicts pressure levels radiated from the system to ensure enough cabin
39. ctions Diagrams section of this manual NL4FC 1 1 2 2 Rear 18 VLF 8Q Front 18 VLF 8 a 1 Negative 1 Positive 2 Negative 2 Positive bling NEXO recommends the exclusive use of multi conductor cables to connect the system the cable kit is compatible with all the cabinets and there is no possible confusion between LF MF and HF sections Cable choice consists mainly of selecting cables of the correct sectional dimension size in relation to the load resistance and the cable length Too small a cable section will increase both its serial resistance and its capacitance this reduces the electrical power delivered to the loudspeaker and can also induce response damping factor variations MADE IN FRANCE For a serial resistance less or equal to 4 of the load impedance CD18 REAR CONNECTOR damping factor 25 the maximum cable length is given by PANEL Lmax ZXS Sin mm Zin Ohm L4 in meters The table below indicates these values for 3 common sizes Load Impedance O0 2 12 6 Cable section Maximum Length meters i5mm awagi fa 456 Je do hz hs amawang a de 6 2 1 4 Examples e The GEO T4805 LF section has 32 Ohm nominal impedance so 6x GEO T4805 LF section wired in parallel will present a 32 6 5 3 Ohm load impedance The maximum acceptable 2x2 5 mm AWG 12 cable length Lmax for s
40. d GEO T4805 The linking bar has two oblong holes When the linking bar is in tension mode position the upper oblong hole is used for 1 25 2 00 3 15 and 5 00 angle settings and the lower oblong hole is used for 0 125 0 20 0 315 0 5 and 0 8 angle settings The angle between a cabinet and the one below it is adjusted using the linking bar from the upper cabinet and the tension mode setting holes in the lower cabinet e Lift bumper and top GEO T4805 assembly and position the next GEO T4805 below the assembly e Lower the bumper and top GEO T4805 assembly carefully until the first and second GEO T4805 side rigging plates locate Use front flanges and side vent ports to guide the assembly IMPORTANT Take extreme care to make sure that hands and fingers are clear of the cabinets and rigging components when the cabinets are brought together Careless operation can cause injury e Fix the two GEO T4805 s by inserting one 12mm x 30 mm push pin in the hole marked SAFETY PIN MUST BE FITTED on each side of the cabinet see figure below IMPORTANT Always insert locking pins into the two SAFETY PIN MUST BE FITTED holes first e Insert two additional 12mm x 30mm push pins in the front pivot point holes see figure below 22 67 T RIGGING PROCEDURE SAFETY PIN MUST BE FITTED HOLE GEO T4805 RIGGING PLATES IN TENSION MODE Lift the bumper and the two first 48
41. d and detailed analysis of the installation Consider taking a training course in using one of these tools if you are not already competent with them it will pay dividends in increased performance of the system USER NOTES Page 65 67 11 USERNOTES France Nexo S A Parc d activit de la dame jeanne F 60128 PLAILLY Tel 33 3 44 99 00 70 33 3 44 99 00 30 E mail info nexo fr www nexo sa com
42. e NEXO recommends regular testing of loudspeaker rigging components preferably using a suitable test rig coupled with a visual inspection e Fasteners there are several critical points in the Geo T cabinets Of primary concern are 8 The machine screws attaching the rigging system to the cabinet b The screws attaching the rear aluminium section to the cabinet C The screws attaching the directivity langes to the front of the cabinet These fasteners should be regularly checked and tightened as necessary e Cleaning The exterior of the cabinet and the rigging system can be cleaned with a damp cloth soaked in mild soapy water On no account use solvent based cleaners which may damage the finish of the cabinet After cleaning the rigging system must be treated with a suitable lubricant to prevent rusting NEXO recommends the use of Scottoil FS365 which is a water based lubricant with a mixture of machine oil surfactant and anti rust treatment NX242 DIGITAL CONTROLLER FOR GEO T Page 41 67 5 NEXO 242 DIGITAL CONTROLLER FOR GEO 5 1 NX242 Proprietary Functions The NX242 is much more than a generic Digital Signal Processor It provides all the standard functions that you expect from this type of unit but its real value is the interface between you and your speaker system The NX242 includes a number of proprietary functions developed and refined during NEXO s 20 years of loudspeaker development experience to ens
43. e Check all GEO T angles with an inclinometer cumulative error should always be lower than 0 59 e Once the bumper is in definitive position a secondary safety steel must be fitted this secondary safety steel should link the bumper to a suitable point in the supporting structure The requirements for secondary safety systems vary with territories However the secondary safety steel MUST have a SWL equivalent to or greater than that of the rigging 459 De rigging and loading out Taking the system down is just a case of doing the reverse procedure to flying the array However there are some important factors to consider 10 GEO T 4805 2 GEO T 2815 SET IN COMPRESSION MODE Lower the array until the bottom cabinet is just off the floor and the bumper is back to horizontal Rotate the LEVA1500 lever counterclockwise until there is no tension on the GEO T kelping chain and no compression on the system Disconnect the LEVA1500 hook from the GEO T bottom bumper and remove the bottom bumper from the array You may have to remove the T2815 s first The array now hangs vertically Link cables must be disconnected and stowed away in the recesses in the rear of each cabinet As the system is lowered it is good practise to disconnect as many loudspeaker cables as can be reached without climbing the array This ensures that a cable should not be accidentally forgotten when the system is separated Damage to the connector
44. e design tool The array assembly system is keyed to the design software and will easily enable you to deploy your design with great precision The NX242 Digital TDcontroller provides driver protection and system optimization as well as DSP driven cardioid pattern control for the T4805 Tangent Array Module and the CD18 Cardioid Dipole Sub bass GEO is a high precision system The GEO HRW controls acoustic energy more precisely than other multiple element waveguides It also makes GEO less forgiving of mistakes Whilst conventional horns never combine into a coherent array they may deliver acceptable results even if the design and deployment of the system is less than optimal This is not the case with GEO where careless installation produces catastrophic results A GEO Tangent Array is not a line array GEO Technology is equally effective in designing and deploying tangent horizontal arrays or curved vertical arrays For best results in a specific application the user needs to know how multi speaker arrays interact with audience geometry along with the benefits and drawbacks of curved vertical arrays and horizontal arrays Curved vertical tangent arrays require different design techniques For the past 20 years sound reinforcement professionals have worked with horizontal arrays that use conventional horns to deliver more or less equal power to equal angles Curved vertical arrays are designed to deliver more or less equal power to equ
45. e gain for each model For example a range of amplifiers with different power outputs all having a published input sensitivity of 775mV OdBm or 1 55V 6dBm will have a wide range of actual gains the higher the power the greater the gain e Various other brands may offer constant gain but only within a given product range for example they may fit fixed input sensitivity only on their semi professional amps e Even if a manufacturer applies the constant gain rule to all models the value selected will not necessarily be the same as that chosen by other manufacturers e Some products can exhibit manufacturing tolerances for the same model of 1dB or more Some amplifiers may have been modified possibly without any label indicating the new values Others may have gain switches fitted internally where it is impossible for the user to verify the actual setting without opening the amplifier casing e ln cases where you don t know the gain of your amplifier or want to check it please follow this procedure 1 Unplug any loudspeakers from the amplifier outputs 2 With a signal generator feed a sine wave at 1000Hz at a known voltage say 0 5V to the input of the amplifier under test 3 Measure the voltage at the output of the amplifier 4 Calculate the gain using the formula Gain 20 LOG10 Vout Vin Some examples GainVin 37dB 1 4 sensitivity 1350Wrms 0 1V 1V 2V 4V 7 1V 0 5V 5V 10V 20V 35 4V Remember that
46. e shall include four front mounted flytracks four rear mounted flytracks and four handles The subbass system shall be the NEXO GEO CD18 with a NEXO NX242 Digital TDcontroller Other integrated loudspeaker controller systems shall be acceptable provided submitted results of testing by an independent laboratory verify that the above specifications are equalled or exceeded 56 67 7 4 GEO T Rigging system 7 4 44 GEO T Bumper 911 mm 35 87 TECHNICAL SPECIFICATIONS H 839 33 03 TEN OS 3 lame 658 25 91 7 4 2 GEO T Beam WEIGHT 45 KG 99 2 LBS 1850 mm 1247 mm 72 837 149 097 1075 42 327 850 mm 33 467 o o o o 9 o E 418 mm je o 405 mm 5 e 9 16 467 ae o 15947 2 o o WEIGHT 53 KG 116 8 LBS TECHNICAL SPECIFICATIONS Page 57 67 7 4 3 GEO T Bottom Bumper 836 5 mm 32 93 35 1 38 18 66 WEIGHT 9 5 20 9 LBS 58 67 TECHNICAL SPECIFICATIONS 7 5 NX242 TDcontroller 7 5 1 Specifications SPECIFICATIONS Output Level Dynamic Range THD Noise Latency time Power
47. e to the pivot point and it is very easy to rotate the cabinet to the desired angle e Once the angle setting push pins are inserted release the rear of the GEO T2815 the angle between the last GEO T4805 and the first GEO T2815 is correct e Check that all push pins are locked and that angle settings are identical on either side 4 3 6 First to second GEO T2815 In tension mode position the upper oblong hole and the upper hole series is used for 6 3 8 00 10 0 12 5 and 15 angle settings e Repeat the steps described in 3 3 4 until all GEO T2815 are positioned e Connect the speaker links e Check the bottom cabinets according to the Checklist procedure described later in this manual 4 3 7 Positioning the cluster e motor hoist only is used the bridle chain length must be adjusted for the correct bumper angle prior to cluster lift e Lift the GEO T array to the height determined in GeoSoft GeoSoft array height definition is for the top surface of the topmost cabinet e Adjust the bumper angle as determined in GeoSoft by lowering or lifting rear motor hoist so that the front height does not change e Check all GEO T angles with an inclinometer cumulative error should always be lower than 0 59 e Once the bumper is in definitive position a secondary safety steel must be fitted this secondary safety steel should link the bumper to a suitable point in the supporting structure IMPORTANT The requireme
48. each amplifier channel For such setup e section NEXO recommends that the amplifier should be capable of delivering 2700 Watts into a 3 Ohm load e LF Rear section NEXO recommends that the amplifier should be capable of delivering 5200 Watts into a 6 Ohm load typically the same amplifier as for the HF section but in Bridged Mono mode LF MF front section NEXO recommends that the amplifier should be capable of delivering 5200 Watts into a 6 Ohm load typically the same amplifier as for the HF section but in Bridged Mono mode 2 2 2 GEO T2815 recommended amplification GEO T2815 is rated for very high power handling and has a 16 Ohm HF or 32 Ohm LF MF nominal impedance These high impedance values allow connection of up to 6 cabinets in parallel for each amplifier channel For such setups section NEXO recommends that each amplifier channel should be capable of delivering 2700 Watts into a 2 Ohm load LF MF section NEXO recommends that the amplifier should be capable of delivering 5200 Watts into a 4 Ohm load typically the same amplifier as for the HF section but in Bridged Mono mode 2 2 3 CD18 Power recommended amplification The CD18 requires two amplifier channels delivering separately processed signals to produce its directional pattern NEXO recommends that each amplifier channel dedicated to CD18 should be capable of delivering 1000 to 2000 Watts into an 8 Ohm load Using the same amplifier mode
49. ent permanent hearing loss if exposure is in excess of the limits as set forth above To ensure against potentially dangerous exposure to high sound pressure levels it is recommended that all persons exposed to equipment capable of producing high sound pressure levels such as this amplification system be protected by hearing protectors while this unit is in operation DISPOSAL OF OLD ELECTRICAL amp ELECTRONIC EQUIPMENT This symbol on the product or on its packaging indicates that it shall not be treated as household waste Instead it shall be handed over to the applicable collection point for the recycling of electrical and electronic equipment By ensuring this product is disposed of correctly you will help prevent potential negative consequence for the environment and human health which could otherwise be caused by inappropriate waste handling of this product The recycling of materials will help to conserve natural resources For more detailed information about ran recycling of this product please contact your local city office your household waste disposal service or the shop where you purchased the product Page 6 67 TABLE OF CONTENTS TABLE OF CONTENTS PLEASE READ CAREFULLY BEFORE PROCEEDING 3 TABLE OF GONTEN adatta etu nude ere a eee ete dee 6 1 ntrOdUCHION cites Ste EE 7 2 GEOT General Set up
50. ers properly configured IMPORTANT NOTE FOR BRIDGE MONO MODE OPERATING AMPLIFIERS e Bridged mono operating mode adds 6 dB voltage gain e Phase relation from amplifier input to output 1 and 2 has to be checked 6 2 4 NX242 Load 2 13 and below Freq Band Mode Gain Switch Limiter High Pass HF Stereo 32 dB None None LF rear Bridged Mono 26 dB None None MF LF front Bridged Mono 26 dB None None CD18 Sub Stereo 26 dB None None 6 2 2 NX242 Load 2 14 and above Freq Band Mode Gain Switch Limiter High Pass HF Stereo 26 dB None None LF rear Bridged Mono 26 dB None None MF LF front Bridged Mono 26 dB None None CD18 Sub Stereo 26 dB None None 6 3 Are amps and the NX properly connected Check that the sense LEDs on the NX242 s used for the full range Tangent Array Modules are connected properly by applying a signal to the corresponding output and verifying that the correct Sense LED illuminates GEO T TANGENT ARRAY SYSTEM CHECK LIST Page 49 67 6 4 Are the speakers properly connected and angled Attach the first 6 array modules to the bumper Before flying verify that all channels of all modules are functioning properly Make sure that each module is producing the proper front rear summation when listening from behind the array switch the front drivers in and out You should hear a reduction in the LF range when the both front and rear drivers are on as compared to w
51. ets are provided for the application as well as mechanical constraints for safe flown systems In addition it provides mechanical information for all clusters in agreement with Structural Analysis Reports available in the Help section dimensions weight gravity center position forces moments working load and safety factor Geo T Structural Analysis Reports have been validated by German Certification Organization RWTUV systems GmbH NS 1 installation package includes all NEXO User Manuals Structural Analysis Reports and Certificates PDF files which can be found in the last section of User Manuals NS 1 is a freeware available for all Nexo users Please contact your local distributor for licensing procedure IMPORTANT Never install a GEO T cluster without checking its acoustical performances and mechanical safety in NS 1 prior to installation Any question or bug report please contact technical nexo fr System GEO T Flown Cluster rS NS 1 GEOT ACOUSTIC PAGE Page 16 67 GEO T RIGGING PROCEDURE 4 GEO T RIGGING PROCEDURE Before proceeding with assembly of GEO T arrays please ensure that the components are present and undamaged A component list is appended to this manual In the event of any shortage please contact your supplier For maximum efficiency the GEO T rigging system requires three experienced persons for set up typically one motor hoist operator and one GEO T operator per side of the array Go
52. ferent EQ on the Sub However it also raises some serious issues for the performance amp safety of the system mostly time alignment 5 6 1 What is the phase relation between the AUX and MAIN output of your mixing desk At NEXO when we align systems we take great care to have an optimum phase alignment from one octave above to one octave below the crossover frequency point By doing so we ensure that both drivers are working perfectly together and providing the best efficiency possible It is then up to the user to adjust the delay on the NX242 to match the physical path difference of the different systems It is thus possible to get a well adjusted system even without measuring instruments If you choose to drive the Sub from the AUX you feed the NX242 with two signals coming from different sources If those two sources MAIN output amp AUX send are not exactly in phase you are introducing a delay without knowing it into the crossover between your GEO T array and your CD18 subs Without the proper measurement tools you will never be able to tune the system as it should be 5 6 2 Why itis unlikely the AUX and MAIN have the same phase e Signal paths are likely to be different any filter modifying the bandwidth and EQ of the signal is also affecting the phase Example a 24dB oct high pass filter set at 15Hz is affecting amplitude of the signal by only 0 6dB at 30Hz but the phase shift is 90 At 100Hz we can still measure
53. fications PRODUCT FEATURES GEO T4805 Components HF 1 x 3 voice coil 1 4 throat neodymium 16 Ohm driver on an hyperboloid reflective wavesource MF LF front firing 2 x 8 20cm long excursion neodymium hi flux 16 Ohm drivers in series LF rear firing 2 x 8 20cm long excursion neodymium hi flux 16 Ohm drivers in series Height x Width x Depth 286 x 903 x 627 mm 11 1 4 x 35 1 2 x 24 5 8 including array assembly system Shape 5 Trapezoid Weight net 52 kg 114 6 105 including array assembly system 1 x AMPHENOL EP6 6 pole socket In 1 x AMPHENOL AP6 6 pole connector Through Connectors Construction Main structure Baltic birch ply with structured black coating Rear section Aluminum with dark grey coating Front finish Injected polyurethane flange metallic gray coating structured black on request Integral flying system Intercabinet angle adjustments 0 125 0 2 0 315 0 5 0 8 1 25 2 0 3 15 5 logarithmic steps SYSTEM SPECIFICATIONS GEO T4805 with NX242 TDcontroller Frequency response a 67 Hz 19 kHz 3 dB Usable range 6 a 60 Hz 20 kHz Sensitivity 1W 1m b 109 dB SPL nominal 107 dB SPL wideband Peak SPL 1m b Flying points Configuration dependent d Vertical plane Configuration dependent d Horizontal plane 90 Low Frequency cardioid Dispersion c Crossover frequencies LF MF 250 Hz active MF HF
54. ge 42 67 NX242 DIGITAL CONTROLLER FOR T Each VCEQ and is controlled via synthesis of several signals from the various detection sections That synthesis is in fact the envelope of those signals with an optimised release and attack time for each VCEQ and VCA depending on its frequency range and the cabinet selected Displacement Control The Sense input signal is sent to a shaping filter producing a signal whose instantaneous amplitude is proportional to the voice coil excursion This signal after rectification is compared to a preset threshold matching the maximum usable value as determined from laboratory measurements Any part of the signal exceeding the threshold is sent to the VCEQ control buffer while the VCEQ acts as an instantaneous very short attack time limiter to prevent displacement from exceeding the maximum permissible value Temperature Control Each sense signal is fed into a shaping filter one per transducer each one producing a signal proportional to the instantaneous current flowing into the voice coil of the transducer After rectification this signal is integrated with attack and release time constants equivalent to the thermal time constants of the voice coil and chassis producing a voltage which is representative of the instantaneous temperature of the voice coil When this voltage reaches the threshold value corresponding to the driver s maximum safe operating temperature the VCA becomes
55. hen the rear drivers only are on When listening from the front you should hear a strong increase in the LF range when connecting the rear drivers To check that all front elements have the proper amplitude and phase you should listen to the six box cluster at a close distance lt 1 meter You should be able to move from the top to the bottom of the cluster without hearing any change in the tonal balance Verify that the angle settings are the same on both sides of each module Raise the bumper attach the next 6 modules and repeat the above checks Make sure that these 6 modules sum properly with the modules above them When all the modules are flown check that the aiming angles are the same left and right Verify that the CD18 is functioning properly when listening from behind the subs summing the front and rear sub drivers lowers the level in comparison with rear driver only Make sure that multiple CD18s are summing properly 6 dB gain per doubling of quantity 6 5 Final Pre Sound Check Check Play a CD track mono left and then right both sides must sound strictly identical When listening in the center between two Vertical Tangent Arrays everything from LF to HF should be located to the phantom center position If not repeat the above check sequence to identify the source of the problem Page 50 67 TECHNICAL SPECIFICATIONS 7 TECHNICAL SPECIFICATIONS 7 1 GEO T4805 Vertical Tangent Array Module 7 1 1 System speci
56. ior to erection and ensure that the system is secured appropriately Take care when stacking cabinets Always employ safe lifting procedures and never attempt to build stacks without sufficient personnel and equipment Never allow anyone whether operators artists or members of the public to climb onto a ground stacked PA system Anyone who needs to climb over 2m high should be fitted with suitable safely equipment including a clip on harness Please refer to local Health and Safety legislation in your territory Your dealer can help with advice on access to this information Apply the same attention to all safety matters when de stacking systems Be aware that safety procedures are as important in the truck and in the warehouse as they are at the venue 18 67 GEO T RIGGING PROCEDURE 4 1 3 Contacts Correct training is fundamental to safe practise when working with loudspeakers flying systems NEXO recommend that users contact local industry associations for information on specialist course Information for International training agencies can be obtained by contacting either The Production Services Association Rigstar Training and Testing Center PSA 82 Industrial Dr Unit 4 School Passage Northampton Massachusetts 01060 U S A Kingston upon Thames Phone 413 585 9869 Fax 413 585 9872 KT1 SDU Surrey school rigstar com ENGLAND Telephone 44 0 181 392 0180 ESTA Entertainment Services amp Technology Associati
57. ition at 5 so that the bottom cabinet sits flat in the flight case Page 26 67 GEO T RIGGING PROCEDURE e All other GEO T4805 s should have their linking bars returned to 0 125 position to ensure that the cabinets stay vertical when landing e Position the flight case underneath the array and carefully lower the array into the flight case taking care not to catch any parts in the case e NB When lowering the system into the flight case alignment is easier if two operators lift the flight case onto the bottom of the system as it is lowered This ensures that the lowest cabinet does not hit the flight case extrusion if the case is to be mis aligned e Remove the front and rear push pins linking the two last cabinets and carefully lift the array using both motor hoists until the array is clear e Repeat the procedure for all cabinets e Remove the GEO T bumper Remember to replace all the pins back in their respective beams 4 4 Compression Mode Full Kelping Beam Setup Compression mode Full Kelping Beam requires the following accessories e GEOT Main Bumper GEOT BUMPER e GEO T Kelping Beam GEOT KELPBEAM e GEOT Bottom Bumper GEOT BTBUMPER GEOT Kelping Chain GEOT BCCH GEO T KELPING CHAIN GEO T MAIN BUMPER GEO T BOTTOM BUMPER GEO T FOLDED KELPING BEAM To be lifted in compression mode the GEO T bumper requires two motor hoists IMPORTANT Front and rear motor hoists must be rated to support the entire
58. l as those used for the GEO T will allow connection of up to 2 CD18 in parallel to one amplifier Stereo Mode Page 12 67 GEO T GENERAL SET UP INSTRUCTIONS 2 3 Current rating It is very important that the amplifier behaves correctly under low load conditions A speaker system is reactive by nature on transient signals like music it will require four to ten times more instantaneous current than its nominal impedance would indicate Amplifiers are generally specified by continuous RMS power into resistive loads however the only useful information about current capacity is the specification into a 2 Ohm load It is possible to perform an amplifier listening test by loading the amps with twice the number of cabinets considered for the application 2 speakers per channel instead of one 4 instead of 2 and running the amps up to the onset of clipping If the signal does not noticeably deteriorate the amplifier is well adapted overheating after approximately ten minutes is normal but thermal protection must not operate too quickly after starting this test 2 4 Amplifier settings 2 4 4 Gain value Gain is the key to correct alignment of the system It is especially important to know the gain of all amplifiers used in your set up The tolerance should be about 0 5 dB In practice this can be difficult to achieve because e Some amplifier brands have an identical input sensitivity for models of different power rating this infers a different voltag
59. lowering the system into the flight case alignment is easier if two operators lift the flight case onto the bottom of the system as it is lowered This ensures that the lowest cabinet does not hit the flight case extrusion if the case is mis aligned Remove front and rear push pins from the two last cabinets and carefully lift the array using both motor hoists until the array is clear Ensure the array is vertical at all times Repeat the procedure for all cabinets Remove the GEO T kelping chain from the GEO T Kelping Beam the GEO T beam and the GEO T bumper Remember to replace all the pins back in their respective beams Fold the kelping beam and pin it into the closed position for transit Compression Mode Half Kelping Beam Setup Compression mode Half Kelping requires the following accessories Main Bumper GEOT BUMPER GEO Kelping Beam Front Beam Only GEOT KELPBEAM GEO T Bottom Bumper GEOT BTBUMPER GEO Lever Hoist 1 5 tonne chain LEVA1500 CHAIN LEVER HOIST 1 5 TONNE MAIN BUMPER GEO T BOTTOM BUMPER GEO T FOLDED KELPING BEAM 34 67 GEO T RIGGING PROCEDURE To be lifted in Compression mode Half Kelping the bumper requires either motor hoist and a bridle or two motor hoists easier initial angle setting In both cases ensure that the motors are properly rated IMPORTANT Motor hoists
60. lown or ground stacked configurations 242 Digital TDcontroller Provides comprehensive control of GEO T Series loudspeakers multiple configurations For a complete description of this unit please refer to the NX242 User Manual The NX242 DSP algorithms and parameters are fixed in software and are updated regularly please consult the NEXO web site www NEXO fr or www NEXO sa com for the latest software releases 74 r di Hu 905 age 8 67 INTRODUCTION GEO Array Flying System fully integrated and accurate flying system that provides safe flexible and simple means of flying Tangent Arrays NOTE Tangent Arrays control the dispersion of acoustic energy with a high degree of precision Inclinometers and laser aiming tools are essential to ensure proper audience coverage when installing a GEO Tangent Array NS 1 simulation software previously NS 1 assists in the design and implementation of vertical tangent GEO arrays Please consult the NEXO web site www NEXO fr or www NEXO sa com for the latest software releases Please devote your time and attention to reading this manual A comprehensive understanding of GEO theory tangent arrays and specific features of the GEO T Series will help you to operate your system at its full potential GEO T GENERAL SET UP INSTRUCTIONS Page 9 67 2 GEO T GENERAL SET UP INS
61. n integral array assembly system with logarithmic steps and 0 01 precision interior components shall be protected by an injection molded polyurethane Configurable Directivity Device flange The full range system shall be the NEXO GEO T2815 with a NEXO NX242 Digital TDcontroller Other integrated loudspeaker controller systems shall be acceptable provided submitted results of testing by an independent laboratory verify that the above specifications are equalled or exceeded Page 54 67 TECHNICAL SPECIFICATIONS 7 3 CD18 Directional Sub Bass 7 3 1 System specifications PRODUCT FEATURES SYSTEM OPERATION Frequency Response Usable Range 6 a Sensitivity 1W 1m b Peak SPL 1m b Dispersion c Directivity Index c Crossover Frequency Nominal Impedance Recommended Amplifiers Electronic Controller Speaker Cables Components 2 x 18 46cm long excursion neodymium 8 Ohm drivers Height x Width x Depth 750 x 1200 x 750 mm 29 1 2 x 47 1 4 x 29 1 2 Shape Rectangular Weight Net 116 kg 256 165 Connectors 2 x NL4MP SPEAKON 4 pole In amp Through Construction Baltic birch ply finish with structured black coating Dark grey carpet finish also available Flying points Integral flying system SYSTEM SPECIFICATIONS CD18 with NX242 TDcontroller 32 Hz 80 Hz 29 Hz 180 Hz 105 dB SPL Nominal 142 145 dB Peak Cardioid pattern over the entire useable bandwidth tw
62. nts for secondary safety systems vary with territories However the secondary safety steel MUST have a SWL equivalent to or greater than the dynamic weight of the rigging system GEO T RIGGING PROCEDURE Page 25 67 4 3 8 De rigging and loading out Taking the system down is just a case of doing the reverse procedure to flying the array However there are some important factors to consider 10 GEO T 4805 2 GEO T 2815 SET IN TENSION MODE Lower the array until the bottom cabinet is just off the floor and close to horizontal position Link cables must be disconnected and stowed away in the recesses in the rear of each cabinet NB As the system is lowered it is good practise to disconnect as many loudspeaker cables as can be reached without climbing the array This ensures that a cable should not be accidentally forgotten when the system is separated Damage to the connector will occur should this mistake be made While holding the rear of the bottom GEO T 2815 remove the linking bar push pins Remove front push pins linking the two last cabinets while supporting the bottom cabinet Remove the bottom GEO T2815 Repeat for all GEO T2815 NB when one cabinet is removed always balance front and rear motor hoists so that the next cabinet is close to horizontal position While holding the rear of the bottom GEO T4805 remove the linking bar push pins and rotate the linking bar back to the Compression Setting Pos
63. o channels of the NX242 are used for the process Q 4 3 amp DI 5 3 dB over the entire useable bandwidth 80 Hz active through NX242 Digital TDcontroller 2x8 Ohm 2 amplifier channels are required for directional operation each rated at 1000 to 2000 Watts into 8 Ohm channel The NX242 Digital TDcontroller presets are precisely matched to the CD18 and include sophisticated protection systems Using the CD18 subbass without a properly connected NX242 Digital TDcontroller will result in poor sound quality and can damage components The front loudspeaker of the CD18 is wired 2 amp 2 while the rear loudspeaker is wired 1 amp 1 The CD18 must use separate cables from the main system Rigging System d Please refer to the user manual before any operation As part of a policy of continual improvement NEXO reserves the right to change specifications without notice Response curves and data anechoic far field above 400 Hz half space anechoic below 400 Hz Usable range data frequency response capability with TD crossover slopes removed Sensitivity amp peak SPL will depend on spectral distribution Measured with band limited pink noise b Refers to the specified 3 dB range Data are for speaker processor recommended amplifier combinations c Directivity curves and data 1 3 octave smoothed frequency response normalized to on axis response Data obtained by computer processing of off axis response cu
64. ocessor recommended amplifier combinations c Directivity curves and data 1 3 octave smoothed frequency response normalized to on axis response Data obtained by computer processing of off axis response curves d Please refer to the GEO T user Manual Usable range data frequency response capability with TD crossover slopes removed TECHNICAL SPECIFICATIONS Page 51 67 7 1 2 GEO T4805 Dimensions 903 mm 35 55 7 1 3 Architects amp Engineers Specifications The 3 way full range tangent array module shall have four 8 inch 16 Ohm long excursion neodymium hi flux cone transducers in series two front firing two rear firing and a 1 4 inch exit 16 Ohm neodymium compression driver on a hyperboloid reflective wavesource Coverage shall be configuration dependent in the vertical plane and 90 in the horizontal plane The system shall have a nominal sensitivity of 109dB 107dB wideband When driven by a NEXO NX242 Digital TDcontroller properly connected to amplification capable of delivering 5200 Watts into a 5 Ohm load 6 cabinets per channel in parallel the system shall produce 138dB peak SPL at 1 meter for a single enclosure configuration dependent when arrayed with a frequency response of 67 Hz to 19 kHz 3 dB 60 Hz to 20 kHz 6 dB The system shall have an active crossover with crossove
65. od synchronisation and crosscheck between the operators are key elements for a reliable and safe set up 4 1 SAFETY FIRST GeoT CD18 Rigging System has been approved by Certification Organization RWT V Structural computations test reports certificates are available in NS 1 or at Nexo upon request We include this section to remind you of safe practice when flying the GEOT CD18 system Please read it carefully However user must always apply his or her knowledge experience and common sense If in any doubt seek advice from your supplier or NEXO agent This manual offers guidance only for GEOT CD18 loudspeaker systems References in this manual to other rigging equipment such as motor hoists steels shackles etc are made to clarify the description of GEOT CD18 procedures The user must ensure that operators are properly trained by other agencies in the use of these items The GEOT CD18 Rigging System has been optimised for the deployment of curved vertical tangent arrays of GEO T4805 T2815 CD18 loudspeakers Vertical angle adjustment between cabinets has been limited to specific settings to ensure correct acoustic coupling The GEOT CD18 Rigging System is a professional precision tool set and should be handled with extreme care Only persons who are fully conversant with the operation of the GEOT CD18 Rigging System and provided with suitable safety equipment should deploy GEO Arrays Misuse of the GEOT CD18 Rigging
66. on 875 Sixth Avenue Suite 1005 NEW YORK NY 10001 USA Phone 212 244 1505 Fax 212 244 1502 info esta org www esta org 4 2 General Description Each GEO T Array Module includes an individual rigging system which is mounted at the NEXO factory Six BLGEOT12 30 push pins are provided with the GEO T4805 Four BLGEOT12 30 push pins are provided with the GEO T2815 All holes on GEO T side rigging plates are 12mm diameter matching the push pins which are 12mm diameter x 30mm length IMPORTANT Provided push pins are specifically rated Never use other push pins than the ones provided with the GEO T components GEO 72815 GEO T4805 GEO T RIGGING PROCEDURE Page 19 67 GEO T angle sequences follow logarithmic scales Angle setting values are e Bumper to GEO T4805 0 e GEO T4805 to GEO T4805 0 125 0 20 0 315 0 50 0 80 1 25 2 0 3 15 5 0 e GEO T4805 to GEO T2815 6 30 8 00 10 0 e GEO T2815 to GEO T2815 6 30 8 00 10 0 12 5 15 The GEO T rigging system has two operating modes e Tension mode the force of gravity sets angles between upper and lower cabinets When the array is lifted into position each cabinet opens automatically to the correct angle e Compression mode pull back force applied between the extreme bottom cabinet and the top bumper set angles between cabinets When the array is lifted into position all cabinets are at 0 and it is only when the pull up fo
67. or being lifted or lowered 444 Subsequent GEO T4805 s e Repeat the above section steps until six GEO T4805 are in place As the assembly is lifted angles between GEO T4805 cabinets will remain at 0 whatever the linking bar positions In Compression the linking bars are free to be adjusted while the system is clear of the ground provided that rear pull up force is not applied e Once the GEO T4805 assembly is completed connect the bottom bumper to the last GEO T 4805 with the 12mm x 30mm push pins inserted in the position marked Safety Pin Must Be Inserted see drawings below ma m lt EN S gt SJ e Check the array according to the Checklist procedure described later in this manual 4 4 5 Last GEO T4805 to first GEO T2815 IMPORTANT Unlike GEO T 4805 GEO T2815 does not have the 0 safety position Compression Mode only applies to GEO T4805 GEO T2815 s must always be installed in Tension Mode e Follow the instructions given in section 3 3 4 for fitting GEO T2815 cabinets in tension mode e Check that all push pins are locked and that angle settings are identical on each side 4 4 6 First to second GEO T2815 In tension mode position the upper oblong hole and the upper hole series is used for 6 3 8 00 10 0 12 5 and 15 angle settings e Repeat the above section steps until you have positioned the required number of
68. p hands and fingers clear of the rigging system 4 3 5 Last GEO T4805 to first GEO T2815 IMPORTANT Unlike GEO T 4805 GEO T2815 does not have the 0 safety position The linking bar has two oblong holes When the linking bar is in tension mode position the upper oblong hole and the upper hole series is used for 6 3 8 00 and 10 0 angle settings e Lift the GEO T4805 array and position the GEO T2815 below the assembly e Using two operators align the GEO T2815 with the lowest GEO T4805 so that the pivot point positions coincide The profiles of the male part of the GEO T2815 and the female part of the GEO T4805 rigging accessories are designed to align the pivot holes correctly Link the bottom GEO T4805 and GEO T2815 by inserting one 12mm x 30 mm push pin in the front pivot point hole on each side of the cabinet see figure ONG fm 20000 2000 12 GEO T 4805 cluster set in tension mode Page 24 67 GEO T RIGGING PROCEDURE e the bumper and GEO T4805 at a height that allows convenient access to the linking bars and angle setting holes e Liftthe rear of GEO T2815 and insert push pins into the desired angle setting hole The centre of gravity of the GEO T2815 is clos
69. per system protection no latency time should be introduced between the output of the NX242 TDcontroller and the input of loudspeakers through use of DSP modules such as internal amplifier signal processing 2 5 Example For a 12 GEO T4805 and 4 CD18 cluster and considering an amplifier model which is capable of delivering 1 x 6000W into 4 Ohm or 2 x 3000W into 2 Ohm or 2 x 2000W into 4 Ohm NEXO recommends the following quantities and settings HF 1 amplifier 6 x GEO T4805 HF per channel mode switch in Stereo position Gain switch in 26 dB gain position all dynamic or filter processing switches off LF MF front 2 amplifiers 6 x GEO T4805 LF MF per amplifier mode switch in Bridge Mono position Gain switch in 26 dB gain position all dynamic or filter processing switches off LF rear 2 amplifiers 6 x GEO T4805 LF Rear per amplifier mode switch in Bridge Mono position Gain switch in 26 dB gain position all dynamic or filter processing switches off Page 14 67 GEO T GENERAL SET UP INSTRUCTIONS e CD18 rear 1 amplifier in stereo mode 2 CD18 rear per amplifier channel mode switch in Stereo position Gain switch in 26 B gain position all dynamic or filter processing switches off e CD18 front 1 amplifier in stereo mode 2 CD18 front per amplifier channel mode switch Stereo position Gain switch in 26 B gain position all dynamic or filter processing switches off Which gives a total of 7 identical amplifiers for su
70. per using a 34 Shackle Page 38 67 GEO T RIGGING PROCEDURE e Rotate the fingerwheel clockwise until the chain is taught e Make a final check that the LEVA1500 chain is correctly installed and store the surplus chain in the chain bag supplied The chain bag should be clipped to the Chain Lever Hoist Unse the LEVA1500 lever to apply the pull up force to the bottom of the array Notice that as the LEVA1500 chain gets shorter the cabinets in the array close together to the angles set by the linking bar adjustments e When all of the cabinets are closed together required force to rotate LEVA1500 lever becomes much stronger This is the indication that the angles have been correctly set IMPORTANT DO NOT attempt to force on LEVA1500 lever once you feel it resisting strongly to rotation you might damage GEOT flying system by doing so IMPORTANT DO NOT attempt to make any changes to the linking bars when the rear pull up force is applied GEO T RIGGING PROCEDURE Page 39 67 4 5 8 Positioning the cluster e f one motor hoist only is used the bridle chain length must be adjusted for the correct bumper angle prior to cluster lift the GEO T array to the height determined in GeoSoft GeoSoft array height definition is for the top surface of the topmost cabinet e Adjust the bumper angle as determined in GeoSoft by lowering or lifting rear motor hoist so that the front height does not change
71. r Lower the array running the two motor hoists simultaneously until the bottom cabinet is just off the floor Run rear motor hoist down until there 15 tension on the GEO T kelping chain and no compression on the system e Disconnect the GEO T kelping chain from the GEO T bottom bumper and remove the bottom bumper from the array You may have to remove the T2815 s first e Run the rear motor hoist back up until the GEO T kelping beam is level and the array hangs vertically e Link cables must be disconnected and stowed away in the recesses in the rear of each cabinet e NB As the system is lowered it is good practise to disconnect as many loudspeaker cables as can be reached without climbing 10 GEO T 4805 2 GEO T 2815 set in compression mode the array This ensures that GEO T RIGGING PROCEDURE Page 33 67 4 5 a cable should not be accidentally forgotten when the system is separated Damage to the connector will occur should this mistake be made In each group of 3 GEO T48055 the linking bar of the lowest GEO T4805 should be returned to the 5 position in order to sit flat in the flight case All other GEO T4805 s should have their linking bars returned to 0 125 position to ensure that the cabinets stay vertical when landing Position the flight case underneath the array and carefully lower the array into the flight case taking care not to catch any parts in the case NB When
72. r points of 250 Hz and 1 3 kHz Low frequency directional control shall be achieved with DSP algorithms Electrical connections shall be made via one 6 pole AMPHENOL EP6 socket and one 6 pole AMPHENOL EP6 plug The system shall have a tuned ported 5 trapezoidal enclosure constructed of 18 ply Baltic birch midsection and aluminium rear driver compartment finished in structured black coating and having exterior dimensions no greater than 286mm H x 908mm W x 627mm D 11 1 4 in H x 35 1 2 in W x 24 5 8 in D the system shall weigh 52kg 114 6 lbs Exterior hardware shall include an integral array assembly system with logarithmic steps and 0 01 precision interior components shall be protected by an injection molded polyurethane Configurable Directivity Device flange The full range system shall be the NEXO GEO T4805 with a NEXO NX242 Digital TDcontroller Other integrated loudspeaker controller systems shall be acceptable provided submitted results of testing by an independent laboratory verify that the above specifications are equalled or exceeded Page 52 67 TECHNICAL SPECIFICATIONS 7 2 GEO T2815 Vertical Tangent Array Module 7 2 1 System specifications PRODUCT FEATURES GEO T2815 Components HF 1 x 3 voice coil 1 4 throat neodymium 16 Ohm driver on an hyperboloid reflective wavesource 2 x 8 20cm long excursion neodymium hi flux 16 Ohm drivers in series Rear Passive Acoustic Resistor Height x Width x Depth 249 x 90
73. rce is applied that the correct angles are obtained Compression mode can be applied either with articulated kelping beam Compression Mode Full Kelping Beam or with fix beam and chain lever hoist Compression Mode Half Kelping Beam TENSION MODE COMPRESSION MODE 4 3 Tension Mode Setup Tension mode is restricted to small bumper initial angle settings 10 depending on configuration and does not require any other accessory than the GEO T bumper GEOT BUMPER In order to increase initial angle settings to 15 depending on configuration GEO T bumper can be connected to front beam of GEO T Kelping Beam GEOT KELPBEAM o o E Page 20 67 GEO T RIGGING PROCEDURE To be lifted in tension mode the GEO T bumper requires either motor hoist and a bridle or two motor hoists easier initial angle setting In both cases ensure that the motors are properly rated IMPORTANT Motor hoists must be rated to support the entire cluster weight For arrays of 6 to 18 cabinets 1 tonne motor hoists are sufficient Arrays of 18 cabinets and above should be supported with 2 tonne capacity motor hoists 431 Front Kelping beam to bumper e Disconnect Rear Beam from Front Beam by removing connecting axis Store Rear Beam e Link the motor hoists to the Kelping Beam using front and rear upper axis fixed beam and ensure that these axes are p
74. roperly locked with the clips supplied e the Kelping Beam and position the bumper below it e Lower the Kelping beam so that the front beam load pin holes are aligned with the bumper load pin holes see drawing KELPING BEAM TO BUMPER SETUP e Connect the Kelping Beam to the bumper with the two axes through the corresponding holes see drawing above and ensure that these are properly locked with the R clips 4 3 Bumper to first GEO T4805 assembly 4 push pins BLGEOT12 35 12mm diameter x 35 mm length connect the top GEO T4805 to the bumper IMPORTANT These 4 push pins are slightly longer than the ones used to connect GEO T Array modules 35mm length instead of 30mm Never use the GEO T 12mm x 30mm push pins to connect the top GEO T4805 to the bumper GEO T RIGGING PROCEDURE Page 21 67 BUMPER TO FIRST GEO T4805 ASSEMBLY e Position the bumper on the first GEO T4805 so that the bumper side slot A is at the rear e Link the GEO T4805 to the bumper using the four 12mm x 35mm push pins provided with the bumper check that all push pins are in the locked position e Link the motor hoists to the bumper using front and rear lifting points and ensure that the bumper lifting pins properly locked with the R clips provided e Ensure that no objects rolls of tape spare pins etc have been placed accidentally on the top of the bumper as they might fall when system is lifted 4 3 3 First to secon
75. rs are free to be adjusted while the system is clear of the ground provided that rear pull up force is not applied e Once the GEO T4805 assembly is completed connect the bottom bumper to the last GEO T 4805 with the 12mm x 30mm push pins inserted in the position marked Safety Pin Must Be Inserted see drawings below VE L 2 i 0 e Check the array according to the Checklist procedure described later this manual 4 5 5 Last GEO T4806 to first GEO T2815 IMPORTANT Unlike GEO T 4805 GEO T2815 does not have the 0 safety position Compression Mode only applies to GEO T4805 GEO T2815 s must always be installed in Tension Mode e Follow the instructions given in section 3 3 4 for fitting GEO T2815 cabinets in tension mode e Check that all push pins are locked and that angle settings are identical on each side 4 5 6 Firstto second GEO T2815 In tension mode position the upper oblong hole and the upper hole series is used for 6 3 8 00 10 0 12 5 and 15 angle settings 4 5 7 Repeat the above section steps until you have positioned the required number of GEO T2815 cabinets Connect the speaker links Check the array according to the Checklist procedure Applying compression Raise the cluster 1 meter off the ground keeping bumper horizontal Manually raise the Bottom Bumper and connect the Chain Lever Hoist hook to the rear of the Bottom Bum
76. rting one 12mm x 30 mm push pin in the SAFETY PIN MUST BE FITTED hole on each side see figure below C SAFETY PIN MUST BE FITTED HOLE GEO T4805 RIGGING PLATES IN COMPRESSION MODE IMPORTANT The push pins for SAFETY PIN MUST BE FITTED holes must always be inserted first e Insert two additional 12mm x 30mm push pins in the front holes see figure below e Lift the bumper and two first GEO T4805 to a height that allows convenient access to the linking bars and the angle setting holes e Release the linking bar push pin from its storage position typically 0 125 when stored in flight cases rotate the linking bar within the side rigging plate and position the linking bar oblong hole in front of the required angle value hole and insert the push pin e Repeat the angle setting procedure on the opposite side of the cabinet e Check that all push pins are locked and that angle settings are identical on each side FIRST GEO T4805 TO SECOND GEO T4805 ASSEMBLY GEO T RIGGING PROCEDURE Page 37 67 IMPORTANT DO NOT attempt to make any changes to the linking bars whilst the system is landed or being lifted or lowered 4 5 4 Subsequent GEO T4805 s e Repeat the above section steps until six GEO T4805 are in place As the assembly is lifted angles between GEO T4805 cabinets will remain at 0 whatever the linking bar positions In Compression Mode the linking ba
77. rves d Please refer to the user manual TECHNICAL SPECIFICATIONS Page 55 67 7 3 2 CD18 dimensions 750 mm 29 53 7 3 3 Architects 8 Engineers Specifications The subbass loudspeaker system shall have two 18 inch long excursion 8 Ohm cone transducers Its horizontal and vertical dispersion shall be 120 cardioid pattern The system shall have a Q of 4 3 cardioid mode over is entire operating frequency range The system shall have a nominal sensitivity of 105dB 1W 1m When driven by a NEXO NX242 Digital TDcontroller properly connected to amplification capable of delivering 1000 to 2000 Watts into a 2x 8 Ohm load two channels required for directional VLF the system shall produce 142 to 145dB peak SPL with a frequency response of 32 Hz to 80 Hz 3 dB 29 Hz to 180 Hz 6 dB The system shall have an active crossover with DSP algorithms for directional control of sub bass with a crossover point of 80 Hz Electrical connections shall be made via two 4 pole NL4MP SPEAKON connectors The system shall have a tuned dual ported rectangular enclosure constructed of 18 ply Baltic birch with low speed port geometry finished in structured black coating or dark grey carpeting and having exterior dimensions no greater than 750mm H x 1200mm W x 750mm D 29 1 2 in H x 47 1 4 in W x 29 1 2 in D the system shall weigh 116kg 256 Ibs Exterior hardwar
78. s adjusted so that arrivals from GEOT array and CD18 sub bass speakers are coincident at a fairly distant listening position In the examples below being the distance from GEO array to listener position being the distance from CD18 to listener position the distance difference is then r r specified meters or feet gt r the delay should be set on the CD18 NX242 TDcontroller e lt the delay should be set on the GEO T NX242 TDcontroller e To convert the result in time delay specified in seconds apply At r r Cr and r in meters C sound speed 343 m S The delay parameter is set in MENU 1 2 set the units to meters feet or seconds according to your preference 5 5 2 Examples Flown CD18s If the CD18s are flown behind a GEO T Array delay will have to be adjusted on the GEO T NX242 TDcontrollers according to distance difference r r see figure below Page 46 67 NX242 DIGITAL CONTROLLER FOR T Stacked 185 If the CD18s are stacked on the ground delay will have to be adjusted on the CD18 NX242 TDcontrollers according to the distance difference r r see figure below 5 6 Driving the CD18s from the AUX send It is quite common to use the AUX send of a mixing desk to drive the Sub section of a PA system This gives the mixing engineer more flexibility to set the level of the subbass relative to the main PA apply special effects or to use a dif
79. speaker systems uses a stand ensure that stand specifications are adapted and that stand height does not exceed 1 40m 55 never move the stand while the speaker is in position Connection and powering precautions remove all connected cables before moving the speaker system turn off AC power of all power amplifier units before connecting the speaker system when turning on the AC power to the audio system always turn on the power amplifier last when turning the AC power off always turn off the power amplifier first when used in cold conditions a gradual power ramp up should applied to the system on an 5 mn period to allow the loudspeaker components to stabilize during the very first minutes of usage Inspect the speaker system periodically Page 4 67 PLEASE READ CAREFULLY BEFORE PROCEEDING SAFETY INSTRUCTIONS FOR NEXO TD CONTROLLERS NEXO ANALOGUE PSTDCONTROLLERS NX242 DIGITAL CONTROLLER NXAMP4x1 AND NXAMP4x4 POWERED CONTROLLERS ARE CLASS 1 APPARATUS AND MUST BE EARTHED THE GREEN AND YELLOW WIRE OF THE MAINS CORD MUST ALWAYS BE CONNECTED TO AN INSTALLATION SAFETY EARTH OR GROUND THE EARTH IS ESSENTIAL FOR PERSONAL SAFETY AS WELL AS THE CORRECT OPERATION OF THE SYSTEM AND IS INTERNALLY CONNECTED TO ALL EXPOSED METAL SURFACES Read these instructions Keep these instructions Heed all warnings Follow all instructions Do use this apparatus near water Clean only with dry cloth Do not
80. st and second GEO T4805 side rigging plates locate Use front flanges and side vent ports to guide the assembly The rigging plates have been designed to locate against each other and so align the holes correctly e Fix the two GEO T4805 by inserting one 12mm x 30 mm push pin in the SAFETY PIN MUST BE FITTED hole on each side see figure below GEO T RIGGING PROCEDURE Page 29 67 SAFETY PIN MUST BE FITTED HOLE GEO T4805 RIGGING PLATES COMPRESSION MODE IMPORTANT The push pins for SAFETY PIN MUST BE FITTED holes must always be inserted first Insert two additional 12mm x 30mm push pins in the front holes see figure below Lift the bumper and two first GEO T4805 to a height that allows convenient access to the linking bars and the angle setting holes Release the linking bar push pin from its storage position typically 0 125 when stored in flight cases rotate the linking bar within the side rigging plate and position the linking bar oblong hole in front of the required angle value hole and insert the push pin Repeat the angle setting procedure on the opposite side of the cabinet Check that all push pins are locked and that angle settings are identical on each side FIRST GEO T4805 TO SECOND GEO T4805 ASSEMBLY 30 67 GEO T RIGGING PROCEDURE IMPORTANT DO NOT attempt to make any changes to the linking bars whilst the system is landed
81. tem always wear protective headwear footwear and eye protection Do not allow inexperienced persons to handle a GEOT CD18 system Installation personnel should be trained in loudspeaker flying techniques and should be fully conversant with this manual GEO T RIGGING PROCEDURE Page 17 67 Ensure that motor hoists hoist control systems and ancillary rigging components are currently certified as safe and that they pass a visual inspection prior to use Ensure that public and personnel are not allowed to pass beneath the system during the installation process The work area should be isolated from public access Never leave the system unattended during the installation process Do not place any object no matter how small or light on top of the system during the installation procedure The object may fall when the system is flown and is likely to cause injury Secondary safety steels must be installed once the system has been flown to the operating height Secondary steels must be fitted irrespective of requirements of the local safety standards applicable to the territory Ensure that the system is secure and prevented from pivoting around the motor hoist Avoid any form of excessive dynamic loading to the assembly structural computations on GeoT Rigging System are based on a 1 1 2 factor for hoist or motor acceleration NEVER attach any item to the GEOT CD18 system other than the GEOT CD18 accessories When flying outdoor s
82. the internal parts or modify them in any way The speaker system contains no user serviceable parts If it should appear to be malfunctioning or damaged discontinue use immediately and have it inspected by qualified NEXO service personnel Water exposure Do not expose the speaker system to direct rain do not use it near water or in wet conditions Do not place containers with liquid on speaker system as they might spill into openings If any liquid such as water seeps into the speaker system have it inspected by qualified NEXO personnel SYSTEM DEPLOYMENT SAFETY RULES Read User Manual before deployment Before use of enclosed speaker system please ensure that anyone involved in system deployment understands the rigging stacking pole mounting safety rules as described in the speaker system User Manual Failure to do this exposes people to potential injury or death Always consult qualified NEXO personnel if the device installation requires construction work and make sure to observe the following precautions Mounting precautions choose mounting hardware and an installation location that can support the weight of the speaker system donot use speaker system handles for suspended installation do not expose speaker system to excessive dust or vibration or extreme cold or heat to prevent possibility of component damage donot place the speaker system in an unstable position from which it might fall accidentally if
83. thms Using GEO T Series cabinets without a properly connected NX242 will result in poor sound quality and can damage components Array design Arrays of less than 4 x GEO T2815 will provide poor dispersion control and are neither recommended nor supported Sub bass CD18 directional sub extends system low frequency response down to 25 Hz Speaker cables HF wired 5 6 MF LF wired 3 4 1 2 not connected through Rigging System Please refer to the GEO user manual before any operation As part of a policy of continual improvement NEXO reserves the right to change specifications without notice Response curves and data anechoic far field above 200 Hz half space anechoic below 200 Hz b Sensitivity amp peak SPL will depend on spectral distribution Measured with band limited pink noise Refers to the specified 3 dB range Data are for speaker processor recommended amplifier combinations c Directivity curves and data 1 3 octave smoothed frequency response normalized to on axis response Data obtained by computer processing of off axis response curves d Please refer to the GEO T user Manual Usable range data frequency response capability with TD crossover slopes removed TECHNICAL SPECIFICATIONS Page 53 67 7 2 2 GEO T2815 Dimensions 903 mm 35 55 SCE m o e lt 9 80 HH 00 gt gt 750
84. tion is to avoid massive clipping of the amplifier which can have some very audible artefacts and in some cases may be damaging to the loudspeakers Modulation of the amplifier s supply voltage rails can create very low frequencies or high frequency high level harmonics Since these occur after the NX242 in the signal path they are not filtered by the TDcontroller circuitry The threshold of the peak limiter is set by the user to match the amplifier s clipping point The second function of the peak limiter is to avoid huge amounts of power being sent to a driver Each driver is protected against overheating and overexcursion but there could be other failure modes that cannot be predicted by simulation especially mechanical damage to the cone Each driver is specified for a certain power handling and a factory set peak limiter threshold is tuned to avoid any abuse 5 2 Cardioid LF and VLF Cardioid LF and VLF is one of the key advances of the T CD18 system This feature is only achievable with a total control of the DSP chain Although the basic concept as presented in audio text books is relatively simple producing a cardioid pattern from a loudspeaker without a major loss of efficiency requires advanced DSP processing NX242 DIGITAL CONTROLLER FOR GEO T Page 43 67 Other loudspeaker management DSP devices not provide the algorithms that the NX242 uses to optimise the cardioid operation of the GEO T4805 CD18 and
85. uch a cluster is 13 25 meters e The CD18 subwoofer has a 2 x 8 Ohm nominal impedance therefore 2 CD18s wired in parallel will present a 2 x 4 Ohm load impedance The maximum acceptable 2x4 AWG 10 cable length Lmax is then 16 meters IMPORTANT Long speaker cables induce capacitive effects up to hundreds of pF depending on the quality of the cable with a low pass effect on high frequencies If long speaker cables must be used ensure that they do not remain coiled while in use 2 2 Amplifier Selection NEXO recommends high power amplifiers in all cases Budget constraints are the only reason to select lower power amplifiers A lower power amplifier will not reduce the chances of driver damage due to over excursion and may actually increase the risk of thermal damage due to sustained clipping If an incident occurs on an installation without protection the fact that amplifiers only generating half their GEO T GENERAL SET UP INSTRUCTIONS Page 11 67 rated output power are used will not change anything in respect of possible damage This is due to the fact that the RMS power handling of the weakest component in the system is always 6 to 10 dB lower than the amplifier rating 2 2 1 GEO T4805 recommended amplification GEO T4805 is rated for very high power handling and has a 16 Ohm HF or 32 Ohm LF Rear LF MF Front nominal impedance These high impedance values allow connection of up to 6 cabinets in parallel for
86. ure that your PA delivers maximum performance and reliability 5 1 1 Upgradable Firmware NEXO releases regular firmware updates Each new release is the result of our ongoing R amp D program combined with user feedback from the field New firmware releases can include new setups for different combinations of NEXO full range loudspeakers and subwoofers improvements to existing setups and new software functions The NX242 is thus evolving with each of those releases profiting from the latest discoveries of NEXO s R amp D department as well as the experience of NEXO users 5 1 2 EQ amp Filtering Subsonic and VHF filtering Low and high pass filters are used to filter out frequencies that could possibly degrade the performance of the TDcontroller and amplifiers The filters are optimised to work in conjunction with overall system response The high pass filters are also extremely important as they help control excursion at very low frequencies which is a major feature for system reliability This is one of the main reasons to avoid using setups which are not designed for the cabinet you are using Equalising acoustical response NEXO loudspeakers are acoustically designed for maximum efficiency over their operating bandwidth The NX242 provides the correction required to obtain a flat system response Active rather than passive attenuation allows the lowering of amplifier voltages for a given output SPL and therefore increases the maximum SP
87. will occur should this mistake be made In each group of GEO T4805 s the linking bar of the lowest GEO T4805 should be returned to the 5 position in order to sit flat in the flight case Page 40 67 GEO T RIGGING PROCEDURE e All other GEO T4805 s should have their linking bars returned to 0 125 position to ensure that the cabinets stay vertical when landing e Position the flight case underneath the array and carefully lower the array into the flight case taking care not to catch any parts in the case NB When lowering the system into the flight case alignment is easier if two operators lift the flight case onto the bottom of the system as it is lowered This ensures that the lowest cabinet does not hit the flight case extrusion if the case is mis aligned e Remove front and rear push pins from the two last cabinets and carefully lift the array using both motor hoists until the array is clear Ensure the array is vertical at all times e Repeat the procedure for all cabinets e Remove the LEVA1500 chain hook from the GEO T font Kelping Beam the GEO T kelping beam and the GEO T bumper Remember to replace all the pins back in their respective beams Reassemble front and rear kelping beams and pin them into the closed position for transit 4 6 Testing and Maintenance of the system e General Geo is a precision piece of equipment and requires regular attention to maintenance in order to give long and reliable servic
88. ystems ensure that the system is not exposed to excessive wind or snow loads and is protected from rainfall The GEOT CD18 Rigging System requires regular inspection and testing by a competent test centre NEXO recommend that the system is load tested and certified annually or more frequently if local regulations require When de rigging the system ensure that the same duty of care is given to the procedure as for the installation Pack GEOT CD18 components carefully to prevent damage in transit 4 1 2 Ground Stacking Safety Statistically many more injuries occur due to unstable ground stacked PA systems than those associated with flown systems There are several reasons for this fact however the message is clear Always survey the supporting structure upon which a ground stack is to be built Always look beneath PA wings to inspect the deck support and if necessary ask for the stage scrims and dressings be removed to allow access If the stage surface slopes as it does in some theatres ensure that the system is prevented from sliding forwards due to vibration This may require the fitting of timber battens to the stage floor For outdoor systems ensure that that the system is protected from wind forces which might cause the ground stack to become unstable Wind forces can be huge especially upon large systems and should never be underestimated Observe meteorological forecasts calculate the worst case effect upon the system pr

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