Nexo NX241 Update - Juice Sound & Light
Contents
1. I g lt sM T8 ZS diBHddH 5 w Buiuunj Aq ajay u s uo os pue 9100 ZXN 195 y JO UOJSJ A 941 1 2 lt mn dgo 1 5 AQ 2 Jey3 Aq ue ueo siy Bumes djeu o dijo Buipio e ajqissod se jsn py woojpeay sesiundo WacapesaH TT WATIOWLNOD GL HEL lt lt L 19501 Buunp gv Buisse1dep Aq sse2oy 2 pepeo sdnjes eui Jo Aue pajas oj Jesn 2 wjsms I B 1 amp 5 1 gt 31109 1NO2D LS 0 nua2. INNOVATE Update to NX241 Manual LOAD2 15 NX241 New Setups NX241 New Functions NX Windows Loader Application Notes r 4 TD CONTROLLER PAGE 2 24 WARNING TABLE OF CONTENTS WARNING LOAD 2 15 SUPPORTED SETUPS LOAD2 15 NEW amp IMPROVED NX241 SETUPS GEO T SERIES amp CD18 8 PS15 ACTIVE LOAD 2 15 NX241 NEW FUNCTIONS amp MENUS MENU 1 1 INPUT METERING MUTE MENU 1 4 MENU 2 6 AMP GAIN MENU 2 7 AMP POWER MENU 2 8 SENSE ALERTS amp RESET DUPLICATION OF THE SUB OUTPUT ON PASSIVE SETUPS DUPLICATION OF THE MAIN OUTPUT ON GEO S PASSIVE WITH CARDIOID SUB SETUPS INPUT PATCH MENU3 2 IMPORTANT INSTALLATION RECOMMANDATIONS AUDIO CHAIN RECOMMENDATIONS SYSTEM ALIGNMENT APPLICATION NOTE DRIVING THE SUB FROM THE AUX SEND NEXO WINDOWS LOADER WARNING INSTRUCTIONS APPLICATION NOTE RECOMMENDED INSTALLATION PRACTICES PURPOSE OF THE RECOMMENDED INSTALLATION PRACTICES SUGGESTED INSTALLATION RULES RATIONALE ON INTERCONNECTION RULES REFERENCES ANNEX QUICK MENU HELP 16 16 16 19 19 19 23 3 24 WARNING DIGITAL TD CONTROLLER NX24 In LOAD2 13 we have been obliged to re organize the DSP memory of the NX241 and we had to erase some information that is normally kept when you update your firmware As a result once the software update is finished you will be prompted to verify the value of the
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4. V 0 Set geoS_ground AkAbak R 180 180 90 90 0 0 90 90 180 180 50 100 200 Frequency Hz The two overlapping phases are those of the CD12 and S805 as they should be The green curve is the same as the blue one with a 2ms delay 1 Sound Pressure of LOAD2 10 Lp Phase Uin 0 707Vrms Distance 1m H 0 V 0 Set al AkAbak R 48 0 10 10 20 20 20 50 100 300 Frequency Hz On the magnitude graph display the difference between the well aligned system and the one with the CD12 2ms delayed The difference is 2dB at 100Hz This example is displaying the consequences of a slightly incorrect alignment If we add to this the delay introduced by a slightly different electric path plus the small delay introduced by some processing plus a EQ filter done by the user near the cut off frequency The graph above could shows differences in excess of 6dB Up to the point where the system might work better if you reverse the polarity of the sub Precautions amp check e Before using the AUX send of your desk ensure that the output are in phase you can feed a 1000 2 signal at the input and monitor the MAIN and AUX on a dual trace scope Always apply or processing to both signals feeding the NX241 So the phase relation is not affected Never add additional low pass filtering on the SUB or high pass to the main system e inverting polarity one
5. TDcontroller that is to say equipment which has a conductive enclosure i e chassis and an internal design which is relatively insensitive to disturbances such as currents induced in the shield connection of signal cables and returning on their protection earth connection s uses shielded balanced pairs or properly connected quad with a high common mode rejection ratio for signal lines The practical design of equipment that is intended to be insensitive to induced currents will implement low impedance between the cable shield terminal of input connectors and the equipment enclosure otherwise a significant disturbance voltage will develop The best method is a direct bonding of this terminal to the enclosure but this is the manufacturer s business Let us focus on how to use equipment In this case as we will show below the best interconnection technique consists of using shielded pair cables with a low transfer impedance shield well below 10 mO m providing a low impedance between cable shields and the cable shield terminal of input connectors and therefore a low impedance to the enclosure having a ground connection which interconnects the equipment enclosure chassis ground as close as possible to the signal cables this is the icing on the cake In practice using XLR connectors means that the cable shields must be connected to the pin 1 at each end of the cable in line with the IEC 60268 12 intern
6. amp power and amp gain in menus 2 6 amp 2 7 respectively Please note the values in these menus before updating the software in your unit LOAD 2 15 Supported Setups In order to change from one cabinet family to another hold the A amp B buttons down when resetting the NX241 Refer to page 10 of the NX241 User Manual 47 setups are currently supported CD18 CD18 SUPERCARDIO Crossover 100Hz CD12 2xCD12 Flown STEREO 1 2 3 4 CD12 1 back CD12 1 front CD18 bac CD18 front CD18 2 bac CD18 2 front Crossover 75HZ CD18 SUPERCARDIO CD18 bac CD18 front CD18 2 bac CD18 2 front Crossover 100Hz CD18 CARDIO CD18 bac CD18 front CD18 2 bac CD18 2 front Crossover 75HZ CD18 CARDIO CD18 bac CD18 front CD18 2 bac 18 2 front CD12 2 back CD12 2 front 2xCD12 Ground STEREO 1 2 3 4 4 S2 cabinets 52 63 Hz CD12 1 back 52 1 CD12 1 front 52 2 12 2 52 43 CD12 2 front 52 4 4 52 cabinets 52 80 Hz AlphaE stereo AlphaE Stereo 1 18 52 1 1 18 Left 52 2 1 18 Right 52 3 AEM Left 52 4 Right AlphaE Stereo X AEM Bl 18xover ALPHAE Mono AEM B1 18 52 63 B1 18 Left S2 B1 18 Right B1 18 AEM Left AEM Right ALPHAE Mono AEM B1 18 52 80 52 1 18 AlphaE Acti
7. in mind that any changes made in the MENU are only saved when the NX241 returns to its default screen showing the current cabinet family or when a setup is saved in MENU 1 5 gain amp power settings are common to all presets Do not turn off your NX241 before saving the amplifier settings NB Even when not in use do not leave sense inputs floating connect them to an amplifier output or short circuit the sense input to avoid cross talk or interference in the sense circuitry Otherwise false error messages could result The gain value is not modified even if the amplifier has reached its clip point In the case of continuous clipping of the amplifier output the NX241 will display the wrong gain value of because the amplifier is no longer working linearly anymore Some amplifiers reduce their output gain when overloaded This may be seen on the NX241 s computed gain e If the Input LED or the DSP LED lit the computed value of the gain may be false Please increase the Headroom value in Menu 1 1 IMPORTANT NEVER insert digital equipment or any kind of signal processing delay lines digital EQ amplifier DSP modules between the output of the NX241 and the input of the loudspeaker cabinet This is because any alteration to the signals may interfere with the sensing algorithms Menu 2 7 Amp Power This menu will help you to enter the amplifier power value into your NX241 This power value will be used to determine th
8. left 5805 right Stereo FLW Xover S805 9 16 boxes 5805 left 5805 right Stereo FLW Xover S805 4 8 boxes 5805 left 5805 right Stereo Grd Xover S805 9 16 boxes 5805 left 5805 right Stereo Grd Xover S805 4 8 boxes CD12 back CD12 front S805 Same as ch 3 Mono CD12 Flown S805 9 16 boxes CD12 back CD12 front S805 Same as ch 3 5 24 LOAD 2 15 SUPPORTED SETUPS DIGITAL TD CONTROLLER NX24 S805 4 8 boxes Mono CD12 Ground CD12 back CD12 front S805 Same as ch 3 S805 9 16 boxes Mono CD12 Ground CD12 back CD12 front S805 Same as ch 3 GeoS 805 CD18 S805 4 8 boxes Mono CD18 Ground CD18 back CD18 front S805 Same as ch 3 S805 9 16 boxes Mono CD18 Ground GeoS 830 CD12 5830 horizontal CD18 back CD18 front S805 Same as ch 3 with CD12 Ground GeoS 830 CD18 5830 horizontal Mono CD18 Ground GeoT 4805 GeoT 4805 2815 Crossover 75Hz CD18 back Back speaker CD18 front Front speaker 5830 left 5830 right wideband stereo S830 horizontal CD12 back CD12 front S830 Same as ch 3 with CD12 Flown S830 horizontal CD12 back CD12 front 5830 Same ch 3 5830 3 GeoT 4805 2815 Crossover 100 2 Back speaker Front speaker TD CONTROLLER PAGE 6 24 LOAD2 15 NEW amp IMPROVED NX241 SETUPS LOAD2 15 New amp Improv
9. subbas Channel 1 is not used channel 2 drives the S2 channel 3 drives the LF of the PS15 and channel 4 drives the HF 7 24 eene NO TD CONTROLLER LOAD 2 15 NX241 NEW FUNCTIONS amp MENUS LOAD 2 15 241 New Functions amp Menus MENU 1 1 Input metering An Input bar graph meter displays input level and headroom before input clip The maximum of the left and right input is shown on the meter Note that the meter does not show DSP clipping The input meter is accessed through the MENU 1 1 HEADROOM by depressing ENTER lt gt button Press the ENTER lt gt button to toggle between the meter and the normal HEADROOM screen Note In meter mode the default screen is not activated The meter also pops up automatically when the signal is above a certain threshold rene TD CONTROLLER arrow above illustrates the available before clipping of the input converters of the NX241 The dynamic range of the meter is 24 dB The scale is given below maximum being OdBFS the red LED marked in clip will light A permanent peak hold allows you to see if input clipping has reached Changing the headroom by turning the wheel resets the peak hold indication You can also reset the peak hold without changing the headroom by pressing the enter lt gt button twice To set the HEADROOM correctly feed a typical example of the loudest
10. Cancel 4 Follow the 3 steps shown the loader window e Browse for your dld file to download Choose your serial port connected to the NX241 The downloader works with Com Ports 1 and 2 only Com 3 and 4 cannot be used e Press Download file to NX241 button 5 Now to complete the procedure you must set the NX241 to Download mode to make it ready to accept the program Power the TDcontroller OFF and then back on TD CONTROLLER As soon as the message DOWNLOADING WAITING appears you press the OK button TD CONTROLLER 4 TD CONTROLLER PAGE 18 24 NEXO WINDOWS LOADER LL Have a look to the status bar to follow the downloading process The Loader sends the first block of code to the NX241 Loader WD6 1 3 0 0 on 16 04 2002 Out 4108 B In 4B Currently Sending Block 3 50 NX241 acknowledges the reception both on the computer the NX241 s LED screen Loader WD6 1 3 0 0 on 16 04 2002 Out26680B n15B Ack Sending Block 14 Ad 08800 160 Downloading continues until progress bar reaches its leftmost position The number in the lower left corner 60 is a timeout A countdown begins when the transmission is broken wrong com port or disconnected when it reaches zero a fault is generated The downl
11. ational standard T3 and also to the shell contact of the connector when this contact is available means that the equipment must provide or be configured to provide a low impedance connection between each pin 1 and the equipment chassis implies that all power cables which contain the protective earth connection for the casing should preferably be connected to mains sockets with short wiring connecting their protective earth 23 24 ___ NO TD CONTROLLER APPLICATION NOTE RECOMMENDED INSTALLATION PRACTICES terminal These are the basic interconnection rules for professional equipment Other additional rules could also be mentioned for instance concerning cable layout and routing but is not our purpose to write a textbook and we will not review them here We only want to put an end to the practice of disconnecting pin 1 on cables Beware If you are using equipment which does not conform to our assumptions our interconnection rules may not apply In fact there is still equipment which suffers from the pin 1 problem defined in 4 pin 1 is not connected with a low enough impedance to the chassis often it is only connected to the signal ground or OV of the internal circuitry a really bad choice and the noise level of the equipment can be degraded by a low current in this terminal At Nexo we consider that pro audio equipment should be capable of withstanding 100 mA in pin 1 of line inputs and outp
12. 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 TD CONTROLLER PAGE 16 24 NEXO WINDOWS LOADER NEXO Windows Loader This manual provides general downloading instructions ONLY Please read the specific instructions readme txt that come with each new LOAD file Warning The latest version of the downloader program NXwin exe provided with each set of upgrade files must ALWAYS be used NULL MODEM or LAPLINK cable is required to connect your PC s RS232 serial port to the 241 5 RS232 serial port Connection from 241 RS232 9 Pin Serial Port to PC s port Receive Transmit The NEXO download software is win32 compatible and has been tested on the following operating Systems m Microsoft Windows 95 m Microsoft Windows 98 m Microsoft Windows 2000 Instructions The files needed to execute your download will be provided as a file You will have to extract the contents of this ZIP archive in a temporary directory using third party software such as WINZIP not provided by NEXO Once extracted you should have access to the following files Two download DLD files the last official release version and the newly released version If you experience any problems with the new version simply reload the old DLD program to return the unit to the previous version e A README TXT that will contain dow
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14. d MAIN output of your 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 NX241 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 NX241 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 main system and your sub Without the proper measurement tools you will never be able to tune the system as it should be Why it is 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 only affecting amplitude of the signal by 0 6dB at 30Hz but the phase shift is 90 At 100Hz we can still measure 25 of phase shift e 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 e signal is pass
15. desired program level into the NX241 Reduce the Headroom by turning the wheel anti clockwise until the INPUT LED or DSP LED indicates the NX241 has reached clipping Then go one click backwards turn the wheel clockwise The signal should now be clearly visible on the meter scale but without reaching the right hand end of the display Mute MENU 1 4 Individual channel muting is made in the DSP processor itself However when all 4 MUTE buttons are active the output relays bypass the circuitry to eliminate any residual noise Menu 2 6 Amp Gain The first line of the display shows the value entered by the user hereafter referred to as user gain while the second line displays the value read by the NX241 directly from the sense lines hereafter referred to as read gain The enter lt gt button allows the user to swap between channels TD CONTROLLER PAGE 8 24 LOAD 2 15 NX241 NEW FUNCTIONS amp MENUS CO The NX241 will display the following messages Read gain 26 0dB The last measured gain value No Reading yet The average of the output signal is too low lt 28dBV to compute the amp gain You will also be warned of any setup problems with LED alerts see MENU 2 8 This read gain value is intended to help you to check the actual measured gain of your amplifier The user gain and the read gain should be the same IMPORTANT Bear
16. dition to the Amp Gain display in MENU 2 6 LED visual alerts will be triggered if user gain and read gain are not the same Note that there are no visual alerts on the POWER computations in MENU 2 7 Amp power k measured value is under user sense thus the system is over protected measured gain value above the user gain oO and thus the system is under protected Small differences are allowed i e there will be no alert if the measured gain is more or less than 1 dB of what the user has entered 4 TD CONTROLLER PAGE 10 24 LOAD 2 15 NX241 NEW FUNCTIONS amp MENUS The first section of Menu 2 8 allows you to reset the gain and power reading to default settings If the enter M button is pressed the values are reset and menu 2 6 is displayed again Use this feature if any physical changes have occurred in your system to start again the measurement process Turn the encoder wheel to reach the second section of Menu 2 8 which is the alert disable menu Press the enter gt button to set the alerts Led flashing on or off Once disabled the LEDs will not flash if gain settings are incorrect This parameter is saved every time the NX241 returns to the default screen or when a setup is saved in the menu 1 5 Duplication of the SUB output on passive setups Output 1 of the passive with mono sub setu
17. e threshold of the peak limiters The first line of the menu displays the amp power entered by the user in the NX241 The second line displays the value the NX241 has found by scanning the highest peak value reached during 9 24 TD CONTROLLER LOAD 2 15 NX241 NEW FUNCTIONS amp MENUS amplifier clipping To properly set the user amp power value please follow the following steps 1 Unplug all loudspeaker cabinets in the system 2 Setthe NX241 on the 4 S2 cabinets S2 80 Hz setup 3 Ensure that the amp volume controls are set to maximum i e no attenuation 4 Ensure that the menu 2 7 user value is put to 5000W so the peak limiting will not interfere with the measurement 5 Feed Pink noise into the system until the amplifier is consistently clipping 6 Readthe value from the display and enter it in the user value The Amp power reading is a real time process and will also display a measurement while operating the system on real conditions However the result may slightly vary according to the setup the frequency of clipping interactions with protections Due to its internal structure the NX241 is unable to detect power value above 2700W If the reading of the measurement is gt 2700W please refer to the amplifier manufacturer documentation to determine the user value Menu 2 8 Sense Alerts amp reset E 241 TD CONTROLLER C 2 a In ad
18. ed NX241 Setups This chapter describes the new amp improved setups released with LOAD2 15 GEO T Series amp CD18 GeoT GeoS CD12 CD18 Alpha ALPHATD B1 M3 Xover for CD18 are still phase compatible LF area with one another However do not mix NX241s running LOAD2 15 and above with LOAD 2 14 or before as they do not share the same reference point in respect of phase Geo T2815 setup is now supported introduced in LOAD2 14 and uses the same setup as the T4805 channels 2 amp 3 linked in parallel with the T4805 The crossover between Geo T4805 and CD18 has been revised Two crossover points are now available 75Hz and 100Hz LF level has been reduced by 6dB Already implemented in LOAD2 14 This means you can now use your amplifiers on the same gain switch settings on LF and HF channels as the NX241 compensates for the 6dB level difference when running the LF amplifiers in bridged mono mode The CD18 is once again available in optimized cardioid amp supercardioid setups Both patterns are available for both crossover frequencies For very high SPL applications NEXO recommends 100 Hz cut off frequency setups GEO S We recommend using the CD18 CARDIO Crossover 100 2 when using the GeoS range with the CD18 subbass Mono setups driving a mono 5805 5830 with a cardioid CD18 subbass are also available e g 5805 9 16 boxes Mono CD18 Ground PS15 ACTIVE A new setup allows active mono operation with the S2
19. he audio chain is strictly identical for SUB s and GeoT mixing board outputs same devices with same settings phase relation between the two feeds is aligned with proper measurement tools SMAART Spectralab MLSSA see below See also the following application note Operation of Multiple TDcontrollers Typically MAIN SYSTEM SUB systems require a minimum of two NX241 s per side one NX241 for MAIN 5 5 another for the SUB s Eventually two or more NX241 s will operate within the same MAIN SYSTEM cluster It is mandatory to verify the consistency of the setups and adjustment between processors to avoid the problems described below When using multiple NX241 s in a single array all parameters should be identical and set to proper values System alignment For a given measurement microphone or listening position the reference point for this adjustment is the closest point of each array SUB and Main System to the given position see example below TD CONTROLLER PAGE 12 24 IMPORTANT INSTALLATION RECOMMANDATIONS We recommend that the system is adjusted so that arrivals from MAIN SYSTEM array and SUB speakers are coincident at a fairly distant listening position typically further than the mixing position Geometrical alignment In the example below r4 being the smaller distance from MAIN SYSTEM array to listener position being the smaller distance from SUB to listener positi
20. ined using a multipoint ground scheme with as many closed ground loops as is economically possible In practice the TDcontroller is intended for rack mounting The rack is a free grounding and shielding structure and it provides extra shielding Therefore it is desirable that the screws used to fix the TDcontroller in the frame or rack provide an electrical contact between the chassis of the TDcontroller and the rack TD CONTROLLER PAGE 22 24 APPLICATION NOTE RECOMMENDED INSTALLATION PRACTICES Rationale on interconnection rules Wording of the basic interconnection rules There are conflicting opinions as to the best way of interconnecting audio equipment In fact different authors and authorities offer their own recipes based on many years of experience Some of these recipes of course conflict with the tips of other experts We wish to explain our view which is based on EMC analysis and experiments In fact there is a good reason for the co existence of diverging views on the best audio interconnect techniques the type of cable assembly this designates the cable with the connectors attached which will give the best result depends on the characteristics of the equipment at each end of the cable assembly and of other characteristics of the whole system However there is only one solution for the best interconnection technique between two normally designed professional audio items for instance between a mixer and a Nexo
21. ing though any digital equipment you are adding between 1 4ms and 2 2ms around 70 phase shift at 100Hz due to the converter delay only The additional delay due to the processing itself look ahead compressor delay can be quite important At the end of the day if you have not measured both outputs in the actual configuration you can be 90 sure that you won t get the correct phase alignment that you would have had if the NX241 was fed by a single source Consequences of badly aligned systems Mis aligned system have less efficiency i e for the same SPL you will be obliged to drive the system harder causing displacement amp temperature protection at lower SPL than a properly aligned system The sound quality will decrease The reliability will decrease as the system is driven harder to achieve the same levels In certain situations you may even need more speakers to do the same job Consider the simple example of the AUX signal passing through a digital device without processing that is adding a delay of 2ms due to its conversion time The AUX is then sent to a CD12 subbass while the MAIN is send to the S850 rig The first graph display the phase around the crossover point 85Hz in this case NX PAGE 15 24 TD CONTROLLER APPLICATION NOTE DRIVING THE SUB FROM THE AUX SEND 2 Sound Pressure of LOAD2_10 Phase Uin 0 707Vrms Distance 1m 0 V 0 Set CD12_ground 0
22. nload instructions e WHATSNEW TXT which will inform you about all new features of the new LOAD 17 24 ene 4 TD CONTROLLER NEXO WINDOWS LOADER The downloader programs NXWIN EXE and the old DOS loader NXLOAD EXE To use the outdated DOS loader please see instructions in the NX241 User Manual also provided in the readme txt file Execute the following procedure to load the new software into the NX241 Flash EPROM 1 Connect the serial cable to the RS232 serial ports on your computer and the NX241 The downloader works with Com Ports 1 and 2 only Com 3 and 4 cannot be used 2 Start your Windows OS 3 Launch the loader N exo NX 241 Firmware Loader NEN For help click here Visite our Web Site com Step 1 Choose file to download 41_92 918 Browse Version Number Step 2 Choose serial port connected to NX 241 Serial Pott 6 Com Step 3 Press the Download button to start the download process Download file to NX241 Loader WD6 1 3 0 0 on 16 04 2002 whilst holding down the MUTE button of channel 1 leftmost mute The controller will now enter Download mode First screen displays the revision number of the RS232 Firmware Now Power on Nx241 while holding Mute 1 button down and wait for the DOWNLOADING WAITING message Press OK Button when ready
23. nt Phase alignment can be considered as correct when phase is coincident over the entire overlapping range typically an 1 octave from 60 Hz to 120 Hz and when the overall response is always superior to SUB s and MAIN SYSTEM s individual response see figure below ESiLive1 SIA Smaartlive File Control Spectrum Transfer Function Impulse View ExternalDevice Options Help V 12 33 PM SIA SmaartLive Spectrum 180 Transfer Impulse Phase E pe Coh Th ad _32 dB Mag Th ar Weight None Meas Sig Ref Sig m MAGNITUDE Smoon 5 Pt amr FFT 32K m m TC 743 ms FR 1 3 Hz Time Window 33 10 0 Presets Bar Load Store 125 250 Frequency Hz MAT E mi Es SMAART alignment 4 CD18 and 12 GeoT measured with microphone on the floor on axis at 45 meters TD CONTROLLER PAGE 14 24 APPLICATION NOTE DRIVING THE SUB FROM THE AUX SEND Application Note Driving the Sub 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 its subbass relative to the main PA apply special effects use a different EQ on the Sub However it also rises some serious issues for the performance amp safety of the system mostly time alignment What is the phase relation between the AUX an
24. oad procedure is complete when the unit resets all LED s on 6 The NX241 now HAS to be reset AGAIN to enter the configuration menu Turn the unit OFF wait 5 seconds and then power back ON or hold down simultaneously the three menu buttons B O TD CONTROLLER 8 Hold down two menu buttons to enter the Configuration Menu to choose your cabinet The unit is now ready for use EIKEN PAGE 19 24 APPLICATION NOTE RECOMMENDED INSTALLATION PRACTICES Application Note Recommended installation practices Purpose of the recommended installation practices Nexo is a supplier of high performance professional loudspeakers that are integrated with TDcontrollers Competent audio engineers are aware that the performance of any audio system depends on proper cabling choice of hardware and other aspects of the installation outside the control of the loudspeaker manufacturer We are however aware that audio professionals use a variety of different cabling techniques At the present time we have not found a standard which covers all the different installation issues which need special attention To this end we feel it is necessary to provide a recommended installation practice which covers the electrical installation of the TDcontroller and of other units to which the TDcontroller is connected At Nexo we give special attention to issues such as input
25. on the distance difference is then r4 r specified meters or feet gt the delay should be set on the SUB NX241 TDcontroller s m r lt r the delay should be set on the MAIN SYSTEM NX241 TDcontroller s m Toconvert the result in time delay specified in seconds apply m At r4 r2 C r and rz 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 However it is a safe practice to double check geometrical alignment with a proper acoustical measurement tool Measuring and aligning phase in the overlapping region Microphone must be set on the ground at a fairly distant listening position typically further than the mixing position Phase must be measured with a wrapped display and measurement must be properly windowed on signal arriving time same window for SUB and MAIN SYSTEM When measurement is synchronized to the system microphone distance phase can be clearly displayed in the low frequency range ___ 13 24 TD CONTROLLER IMPORTANT INSTALLATION RECOMMANDATIONS If the MAIN SYSTEM phase reading appears to be superior to the SUB phase reading then MAIN SYSTEM will have to be delayed with a value close to the one given by the geometrical alignment If SUB appears to be in advance to MAIN SYSTEM then SUB will have to be delayed with a value close to the one given by the geometrical alignme
26. ources and loads to a TDcontroller The TDcontroller is intended to be used with symmetrical balanced sources for instance a mixer and symmetrical loads for instance a power amplifier as shown in Fig 1 above You can see that the TDcontroller provides a low impedance path between pin 1 of its XLR connectors and its chassis assuming the ground lift option when available is not activated The TDcontroller can sustain high current in pin 1 without degradation of output noise We recommend that the sources and loads you use have the same desirable characteristics It is sometimes claimed that connecting cable shield at both ends creates ground loops and that the current flowing in such loops will produce noise As explained in Section 4 this is not the case for most professional audio equipment In short there are two kinds of loops in which voltages are present the loops formed by signal wires and the loops formed by grounded conductors among which are protective earth conductors PE and signal cable shields When a cable shield is grounded at both ends a loop is closed and the resulting current causes a reduction of the voltage induced on signal lines This effect is what the cable shield is intended to produce since this is how it protects your signal from magnetic fields 21 24 ___ NO TD CONTROLLER APPLICATION NOTE RECOMMENDED INSTALLATION PRACTICES If you are using an asymmetrical unbalanced source it i
27. output compatibility type of signals levels connectors for wanted signals and electromagnetic compatibility EMC for unwanted phenomena emission of disturbance and immunity to disturbance With regard to input output compatibility we have to deal with a wide range of input and output signals grounding methods cables and connectors Insufficient standardization means that there are a wide range of possible system configurations in the field many of which are unsuitable for a good installation Regarding EMC Nexo s TDcontrollers comply with the technical requirements expressed in the standards for the implementation of the 89 336 EEC directive the directive in Europe Nexo has internally determined additional requirements for its products as a result of a review of relevant electromagnetic environments common installation practices and the possible effects of interference in the field TDcontrollers will provide the best performance in terms of signal to noise ratio in the normal system configuration and electromagnetic environment recommended by Nexo Suggested installation rules Electromagnetic environments The emission this word describes all types of electromagnetic noise radiated by the equipment requirements which have been applied to Nexo s TDcontrollers are the stringent requirements of the Commercial and light industrial environment of the product family EMC standard T1 for emission The immuni
28. ps PS range Alpha E passive was unused on previous LOADs Since LOAD2 11 this output duplicates the signal sent to channel 2 SUB Channels 1 amp 2 will behave identically For example muting channel 2 will also mute channel 1 Muting channel 1 has no effect There is no computed gain amp no computed power for channel 1 reading yet will be displayed in menus 2 6 and 2 7 for channel 1 Note that the sense indication provided by channel 1 will be ignored Protection will only rely on the signal from channel 2 therefore channel 1 of the amplifier MUST be set with exactly the same gain and volume control setting as the one driving channel 2 Duplication of the MAIN output on Geo S passive with cardioid sub setups Channel 4 of the 5 passive with cardioids sub setups was not used on previous LOADs From LOAD2 15 this output will duplicate the signal sent to channel 3 Main Channels 3 amp 4 will behave identically For example muting channel 3 will also mute channel 4 Muting channel 4 won t have any effect There is no computed gain 4 no computed power for channel 4 No reading yet will be displayed in menu 2 6 and 2 7 for channel 4 Input Patch MENU3 2 Each output group of outputs when system uses more than output per cabinet like the Alpha M3 or CD12 CD18 subs may be configured to receive either LEFT RIGHT or LEFT RIGHT inputs The Lef
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30. s best to use a shielded twisted pair and to connect wire 3 of the cable to the shield at the source output end as shown in Fig 2 This technique prevents noise currents flowing on the return path of the signal If you are using an amplifier with an asymmetrical unbalanced input it is best to use a shielded twisted pair and to connect wire 3 at the TDcontroller end only as shown in Fig 2 This keeps a good capacitance balance for the signal however noise currents flow on the return path of the signal Note that this is only acceptable for a short cable bw Z MiXER 2 ov SAFETY GROUND 4 N roller N Fig 2 Connecting asymmetrical sources and loads to a TDcontroller If you are using a symmetrical balanced source or amplifier which is prone to become noisy when a current of less than 100 mA at the mains frequency 50 Hz or 60 Hz is sourced into pin 1 of its XLR connectors you might consider opening the ground loops Grounding shielding and mounting the TDcontroller in a rack The primary reason for grounding is safety Conformance to the applicable requirements of the authorities having jurisdiction is of course mandatory However grounding also has an impact on electromagnetic compatibility From the EMC point of view it is desirable to have a low impedance ground network as a current flowing in the ground network will then produce low voltage in the network A low impedance network can be obta
31. t and Right mode sums the two inputs together but attenuates the level by 6dB to compensate It is thus possible to drive the main system from the LEFT input while the sub is driven by the RIGHT input and fed to the AUX of the mixing desk However some precautions must be taken while splitting the system between MAIN and AUX outputs of the mixing desk See the application note at the end of this manual EIKEN PAGE 11 24 ea NALA IMPORTANT INSTALLATION RECOMMANDATIONS Important Installation Recommandations Audio Chain Recommendations About Loudspeaker Management Devices The NX241 s factory delay presets are optimised to provide the best possible crossover between the MAIN SYSTEM and SUB systems Optimum results are always obtained for strictly identical signals feeding simultaneously all the NEXO NX241 controllers Typically this signal is delivered by the stereo bus output of a parametric graphic stereo equalizer which is fed by the stereo output of the mixing console Inserting devices such as loudspeaker management controllers that modify the phase relationship between SUB s 241 and MAIN SYSTEM s NX241 inputs will lead to unpredictable results and will severely damage the final result NEXO strongly recommends avoiding use of such devices Operating SUB s fed through an Aux Output If the SUB s are to be operated through a different output than the main system NEXO strongly recommends that t
32. ty this word describes the ability to cope with electromagnetic disturbance generated by other items and natural phenomena requirements that we have considered exceed those applicable to the Commercial and light industrial environment of the product family EMC standard T2 for immunity In order to provide a further safety margin we recommend that you do not operate the TDcontrollers in the presence of electromagnetic disturbances exceeding half of the 4 TD CONTROLLER PAGE 20 24 APPLICATION NOTE RECOMMENDED INSTALLATION PRACTICES limits found in this standard These two EMC standards are those applicable to pro audio equipment for the implementation of the EMC directive Analogue signal cables Analogue signals should be connected to the input and output ports of the TDcontroller via shielded twisted pair or quad cable fitted with XLR connectors on the TDcontroller side We recommend the use of low transfer impedance cables with a braided shield and a transfer impedance below 10 For sense inputs the noise requirements stringent of twisted pair cable will be adequate For the digital TDcontrollers having a serial connector for loading upgraded firmware it is best to use a cable shorter than 2m and to remove the serial link when the TDcontroller is in use AMPLIFIER SAFETY GROUND roller N Fig 1 connecting symmetrical s
33. uts at the power frequency 50 Hz or 60 Hz without noise degradation If your installation contains equipment which does not meet this requirement or if you have really high leakage currents flowing on your signal cables when you ground them at both ends this should not be the case the one end only practice may provide better results at the power frequency but it brings disadvantages at higher frequencies as explained in Section 5 3 This is why the NX241 TDcontroller provides a ground lift option through a menu References T1 EN 55103 1 1996 Electromagnetic compatibility Product family standard for audio video audio visual and entertainment lighting control apparatus for professional use B Part 1 Emission T2 EN 55103 2 1996 Electromagnetic compatibility Product family standard for audio video audio visual and entertainment lighting control apparatus for professional use B Part 2 Immunity 3 IEC 60268 12 1987 IEC 60268 12 1987 A1 1991 IEC 60268 12 1987 A2 1994 Sound system equipment Part 12 Application of connectors for broadcast and similar use ay eq sjauueyo suoreouioeds sjeulqeo nd ay Buiss id uesouo eq ued jeuueuo y pue leeuw y Jes eq Jamod y jeuueuo Aare JO sj JO Jemod ay 1 0 Jasn u 5141 Aa
34. ve TD CONTROLLER PAGE 4 24 LOAD 2 15 SUPPORTED SETUPS ALPHAE ACTIVE 3W 1 18 1 18 ALPHAE ACTIVE 4W 52 1 18 52 1 18 Alpha ALPHATD B1 M3 1 15 SubTD ALPHATD S2 B1 M3 52 1 15 SubTD 52 63 Hz ALPHATD S2 B1 M3 52 1 15 SubTD 52 80 Hz ALPHATD B1 M3 1 15 A HF Xover for CD18 ALPHATD B1 B1 M3 B1 15 B1 15 1 2 PS8TD Wideband SUB PS8 left PS8 right PS8TD crossover With LS400 PS10TD Wideband NO SUB Same as ch 2 LS400 PS8 left PS10 left PS8 right PS10 right PS10TD Crossover With LS500 PS15TD Overlap Same as ch 2 LS500 PS10 left PS10 right With S2 PS15 active PS15TD ActiveXOV S2 2 LF 3 HF 4 S805 4 8 boxes Same as ch 2 LS1200 PS15 left PS15 right With LS1200 PS15TD Crossover Same as ch 2 LS1200 PS15 left PS15 right With LS1200 PS15TD Crossover Same as ch 2 S2 PS15 left PS15 right LF Left LF right HF Left HF right LF 1 2 HF 3 4 PS15TD Active LF Left LF right HF Left HF right LF 1 2 HF 3 4 PS15TD ActiveXOV B 52 GeoS 805 CD Mono CD12 Flown S805 left 5805 right No Sub S805 9 16 boxes 5805 left 5805 right Sub 5805 4 8 boxes 5805
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