Nexo ALPHA Series Manual
Contents
1. CURVES Alpha EM Alna EMIK 10 000 Ap as Impedance Alpha EM Ohm LH AN e Figure 19 Frequency Response with AlphaE TDcontroller e Figure 20 Impedance Ohms dB luu Index IB Apta EM aE Angie Alpha EM beares 56906 c M T D Ki LA e Figure 21 Directivity Index dB and Factor e Figure 22 Nominal Coverage 6 dB Degrees Horizontal OI As Response Alpha EM 08 me Verical Of Axis Response Alpha EM 485 A ES TT NEEDS No us 10 00 EM TN 20 00 20 00 LO e Figure 23 Horizontal Off Axis e Figure 24 Vertical Off Axis Frequency Response 10 20 30 Frequency Response Q 10 20 amp 30 Alpha EF on AS Response Alpha EF VI AlphaETD Controle 05 Alpha EF Ohm 2 ON KETT SEI e Figure 25 Frequency Response with AlphaE TDcontroller e Figure 26 Impedance Ohms Black LF Grey MF4HF dB Freguency Response Curves Anechoic Far Field above 200 Hz Half space Anechoic below 200 Hz Impedance Voltage to Current Ratio2. e Figure 17 Horizontal Off Axis Frequency Response 10 20 amp 30 e Figure 18 Vertical Off Axis Frequency Response 10 20 amp 30 Frequency Response Curves Anechoic Far Field above 200 Hz Half space Anechoic below 200 Hz Impedance Voltage to Current Ratio Free Field measurement Off Axis Frequency Response 1 3 octave smoothed frequency response normalised to On Axis response Directivity Curve Coverage Angle and Polar Diagram from computer processing on off axis response curves ALPHA SERIES USER MANUAL V1 0 DATE 14 01 00 18 27 PAGE 29 37 CURVES Alpha M8 Horizontal Directivity 5dB div ALPHA SERIES USER MANUAL V1 0 DATE 14 01 00 18 27 PAGE 30 37 CURVES Alpha M8 Vertical Directivity 5dB div 270 90 270 gt E JJ 240 120 240 210 210 150 210 180 180 0 0 330 30 330 30 330 A P 60 00 300 b 2 5 kHz NS 120 40 150 210 150 180 180 0 0 A 30 330 30 05 0 3t 90 270 2 3t 90 270 2 330 aN 12 5 kHz 120 4t 60 90 270 120 60 90 270 120 ALPHA SERIES USER MANUAL V1 0 DATE 14 01 00 18 27 PAGE 31 37
3. 90 270 120 40 WS 150 it CER SS l AT SOX A LIEN A LN Alpha M3 Vertical Directivity 5dB div 1111 E 38 7 D Nat SS 7 Ga S SD E qu oe e SZ Q a KJ ATN le a I 0 GM KS SA ALPHA SERIES USER MANUAL V1 0 DATE 14 01 00 18 27 CURVES PAGE 28 37 Alpha M8 en Reaponse Alpha MB With Controler GE impedance Alpha MB hm 10 00 ix iH SEE e Figure 13 Frequency Response with Alpha TDcontroller dB e Figure 14 Impedance Ohms Black MF Grey HF Directivity Index dB amp Q Alpha M8 20 000 15 000 10 000 5 0000 0 0 ss 200 Coverage Angle Alpha M8 Degree N 20 100 EA e Figure 15 Directivity Index dB and Factor e Figure 16 Nominal Coverage 6 dB Degrees Horizontal Off Axis Response Alpha M8 dB 10 000 0 0 nig NAT 20 00 30 00 10 000 0 0 10 00 20 00 30 00 Vertical Off Axis Response Alpha M8 dB NI EE
4. morsa PT mom moren P In Out In Out MF A In Out MF P Not connected HF CS AE EE A In Out 1 o mur In VLF S2 m owtrg nowe P In Out MF HF In Out MF A In Out MF P N In Out HF ot connected A In Out HF P MF HF passive A MF HF active ALPHA SERIES USER MANUAL V1 0 DATE 14 01 00 18 27 PAGE 6 37 GENERAL SET UP INSTRUCTIONS Cables 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 VLF LF MF and HF sections Cable choice consists mainly of selecting the correct cable section size in relation to the load resistance and the cable length Too small a cable section will increase its serial resistance this would induce power loss and response variations damping factor For a serial resistance less or equal to 4 of the load impedance damping factor 25 the maximum cable length is given by Lmax ZXS Sin mm Z in Ohm Lmax in meters The table below indicates these values for 3 common sizes Load Impedance Q 2 3 4 6 8 12 16 IMPORTANT NOTE Long speaker cables induce capacitive effects that impair the quality of audio signals If long speaker cables must be used ensure that they do not remain coiled while in use Flying the System Alpha Series loudspeakers are equipped with steel anchor plates
5. Jejoduooq L LYZXN D SP4 CABLE 9 119v9 8dS 8 845 8 8dS 8L La SP4 CABLE ALPHA SERIES USER MANUAL V1 0 DATE 14 01 00 16 23 PAGE 37 37 CONNECTIONDIAGRAMS B1 18 e SP4 CABLE MS M8 Q SP8 CABLE B1 18 SP4 CABLE M3 M8 Q SP8 CABLE S2 SP4 CABLE M3 M8 Ej SP8 CABLE S2 SP4 CABLE A Recommended Amplifiers ALPHA M3 HF 350 to 500 Watts into 12 ohms ALPHA M3 MF 650 to 900 Watts into 12 ohms ALPHA B1 18 B1 15 900 to 1400 Watts into 6 ohms NX241 TDcontroller Bs o 3 238 ga ALPHA S2 1800 to 2400 Watts into 3 ohms SP4 CABLE NX241 TDcontroller H SP4 CABLE A MS M8 SP8 CABLE M3 M8 9 SP4 CABLE B1 18 SP8 CABLE M3 M8 i SP4 CABLE B1 18 SP8 CABLE SP4 CABLE E Es 5 C 2 S
6. LF MF 210 Hz Active Frequency MEE 22k Passive MF HF 2 2 kHz Passive Nominal LF 6 ohms 4 7 min Impedance ens arin MF HF 8 ohms 7 5 min Recommended A MF 900 to 1400 Watts into 6 ohms Amplifiers 70016 1000W atts into EGGS ME HF 700 to 1000 Watts into 8 ohms FEATURES ALPHA EM ALPHA EF Components LF 1 x 18 46cm 6 Ohms Composite MF 1 x 10 24 cm 8 ohms Curve HF 1 x 3 Ceramic Driver Titanium MF 1 x 10 24 cm 8 ohms diaphragm HF 1 x 3 Ceramic Driver Titanium Coaxial mounted wave guide diaphragm Coaxial mounted wave guide Height x Width x 400 x 689 x 754 mm Carpet version 1200 x 689 x 754 mm Carpet version Depth 15 3 4 x 27 1 8 x 29 11 16 47 1 4 x 27 1 8 x 29 11 16 Shape 22 5 Trapezoid Weight Net 98 kg 209 Lb 46 6 kg 99 Lb With wheel board 105 kg 231 Lb Connectors 2 x 8 poles Speakon In Out 1 amp 1 Sub bass S2 2 amp 2 Bass B1 3 amp 3 MF HF 4 amp 4 NC 1 x 4 poles Speakon to B1 amp S2 1 amp 1 Sub bass S2 2 amp 2 Bass B1 Construction Baltic Birch with Dark Grey carpeting Structured Black coating painting finish also available Handles 2 Metal Bar Handles 4 Metal Bar Handles Front Finish Acoustic Foam on hex perforated steel grid 77 transparent Flying points 4 Flying Tracks on front 7 positions on 2 steps optional Top to bottom Steel Back plate 4 Flying Tracks on Back Hinge fixing Internal top to bottom Steel links Painted version without
7. values and some may have gain switches fitted internally where it is impossible for the user to verify the actual setting without opening the amplifier casing In cases where you don t know the gain of your amplifier or want to check it please read the following instructions 1 Unplug any cabinet from the amp 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 ALPHA SERIES USER MANUAL V1 0 DATE 14 01 00 18 27 PAGE 17 37 AMPLIFIERS 3 Measure the Voltage at the output of the amplifier 4 Calculate the gain using the formula Gain 20 LOG10 Vout Vin Some examples 37dB 1 4V sensitivity 1350Wrms 0 5V 5V 10V 20V 35 4V 1V 10V 20V 40V 70 8V Remember that constant sensitivity settings will give a different gain value when the amplifier power is different Gain value NEXO recommends low gain amplifiers 26dB is recommended as it is at the same time adeguately low and guite common amongst amplifier manufacturers This gain setting improves signal to noise ratio and allows all preceding electronic equipment including the TDcontroller to operate at optimum level Remember that using a high gain amplifier will proportionally raise the noise floor by the same amount Advanced protections Some high end amplifiers may have some advanced functions similar to those found in the NX241 TDeontroller loudspeaker
8. 0 39 5 38 8 37 8 M8 hor 0 0 1 0 3 8 6 8 11 3 14 3 18 0 21 0 25 0 28 8 31 0 33 0 34 3 35 0 36 0 37 0 38 0 39 5 38 0 M8 vert 0 0 2 0 5 8 11 0 15 5 20 0 23 3 27 0 30 0 33 0 348 36 5 37 3 38 0 39 0 40 0 41 0 40 5 38 0 EMEF hor 0 0 15 3 8 55 6 8 9 3 123 16 0 19 8 23 8 265 283 293 30 0 31 0 33 8 33 0 33 5 32 3 EMEF vert 0 0 2 8 7 8 12 8 16 3 19 3 21 8 24 0 26 0 28 3 30 0 31 0 32 5 33 8 34 5 35 0 34 8 34 0 32 3 8000 Hz 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 M3 hor 0 0 15 7 0 13 3 18 5 22 3 25 0 29 5 34 8 39 0 428 45 3 45 5 47 8 48 8 47 0 48 0 46 3 47 3 M3 vert 0 0 1 8 7 0 13 5 18 8 21 5 25 0 28 5 33 8 38 0 40 5 42 5 445 45 5 46 3 47 3 48 0 49 0 47 3 M8 hor 0 0 0 3 2 0 6 3 11 8 15 0 19 0 22 5 28 0 31 8 40 5 43 0 44 0 45 0 46 0 47 0 48 0 49 0 47 5 M8 vert 0 0 1 8 5 8 11 3 165 20 8 243 29 0 32 0 35 0 42 0 44 0 45 0 46 0 47 0 48 0 49 0 47 0 47 5 EMEF hor 0 0 0 8 3 0 6 0 8 0 115 145 18 5 243 30 0 33 8 36 3 37 0 39 3 40 5 41 8 41 8 42 5 42 0 EMEF vert 0 0 3 3 9 5 15 5 20 0 23 3 24 5 26 5 30 8 34 3 36 0 38 0 38 8 39 8 40 0 41 5 41 5 40 8 42 0 NOTE Those data are also available in electronic format EASETM compatible contact your NEXO agent ALPHA SERIES USER MANUAL V1 0 DATE 14 01 00 18 27 PAGE 24 37 CURVES CURVES Alpha S2 n Reaponse Alpha 52 WI SubTD Controls AE n impedance Alpha 52 On e Fig
9. Flying Tracks also available Fixed Installation The X BOW Flying Tracks can also receive standard Aircraft Flying Fittings As part of a policy of continual improvement NEXO reserves the right to change specifications without notice al Response Curves and Data Anechoic Far Field above 200 Hz Half space Anechoic below 200 Hz Usable Range Data Frequency Response Capability with TD crossover slopes removed bp Sensitivity 8 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 normalised to On Axis response Data obtained by computer processing on off axis response curves ALPHA SERIES USER MANUAL V1 0 DATE 14 01 00 18 27 PAGE 23 37 TECHNICAL SPECIFICATIONS Directivity Tables Off Axis Attenuation from On Axis Frequency Response dB 125 Hz 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 B1 M hor 0 0 0 5 1 3 2 0 2 5 3 5 43 4 5 5 0 48 6 0 6 0 6 5 6 8 6 3 7 0 6 3 5 8 5 5 B1 M8 vert 0 0 0 3 0 5 1 5 2 0 2 8 3 5 43 48 55 6 0 6 8 6 8 6 0 7 0 6 5 6 0 5 5 5 5 B1 M8 hor 0 0 0 5 1 3 2 0 2 5 3 5 4 3 4 5 5 0 4 8 6 0 6 0 6 5 6 8 6 3 7 0 6 3 5 8 5 5 B1 M8 vert 0 0 0 3 0 5 15 2 0 2 8 35 43 48 5 5 6 0 6 8 6 8 6 0 7 0 6 5 6 0 5 5 5 5 EMEF hor 0 0 0 3 0 5 1 0
10. Free Field measurement Off Axis Freguency Response 1 3 octave smoothed freguency response normalised to On Axis response Directivity Curve Coverage Angle and Polar Diagram from computer processing on off axis response curves ALPHA SERIES USER MANUAL V1 0 DATE 14 01 00 18 27 PAGE 32 37 CURVES Alpha EM Horizontal Directivity 5dB div ST T IR KA KR NOS UE DL T rsa NN NL AN ed JA SN AN AA SA AY Wy ALPHA SERIES USER MANUAL V1 0 DATE 14 01 00 18 27 PAGE 33 37 CURVES Alpha EM Vertical Directivity 5dB div ALPHA SERIES USER MANUAL V1 0 DATE 14 01 00 18 27 PAGE34 37 DIMENSIONS DIMENSIONS Jes 94 54 62 5952 98 8 2 S09 F log 42889 29 dl 8 ez A 009 094 54 62 29 52 56 ligil T 44889 20 CD Lev Le 008 L9L LL 62 94 62 L 8 1 25 44889 L91 1 62 vGL 6 Lsel L8 zz 688 889 og 292 ALPHA SERIES USER MANUAL V1 0 DATE 14 01 00 1
11. Range 150 Hz 20 kHz 150 Hz 20 kHz 6dB a Sensitivity 1W 110 dB SPL 108 dB SPL 1m b pe SPL im 145 dB Peak 143 dB Peak Dispersion c 35 x 35 75 x 45 HF Horn Rotatable Directivity Q amp DI Q 32 DI 15 dB Nominal f gt 630 Q 20 DI 13 dB Nominal f gt 630 c Hz Hz Nominal MF 12 ohms 15 5 min MF 12 ohms 15 5 min Impedance HF 12 ohms 8 0 min HF 12 ohms 8 0 min Recommended MF 650 to 900 Watts into 12 ohms MF 650 to 900 Watts into 12 ohms Amplifiers HF 350 to 500 Watts into 12 ohms HF 350 to 500 Watts into 12 ohms FEATURES ALPHA M3 ALPHA M8 MF 2 x 10 24 cm 8 ohms 3 Coil Drivers Dual Ring Phase Plugs Components HF 1 x 3 Neodynium Driver Titanium diaphragm Coaxial mounted wave guide Height x Width x 600 x 689 x 754 mm Carpet version Depth 23 5 8 x 27 1 8 x 29 11 16 Shape 22 5 Trapezoid 57 kg 126 Lb Weight Net With wheel board 64 kg 141 Lb 1 amp 1 Sub S2 2 x 8 poles Speakon In Out di S A ea B1 Connectors 4 amp 4 HF 1x4 poles Speakon to B1 amp S2 hp s 255 Construction Baltic Birch with Dark Grey carpeting Structured Black coating painting finish also available Handles 2 Metal Bar Handles Front Finish Acoustic Foam on hex perforated steel grid 7796 transparent 4 Flying Tracks on front 7 positions on 2 steps Top to bottom Steel Back plate Flying points 4 Flying Tracks on Back Hinge fixing Internal
12. to the B1 cabinet while mid 8 right hand window upper label GMF contain indicators concerning servo control operation for the Alpha M4 1 Wideband Xover Push button This button is intended to modify the high pass filtering of the Alpha B1 cabinet Release 0 Date 03 12 99 Quick ref guide Alpha TDcontroller NN PAN p 2 Error Style not defined In the Wideband position the cabinet is exploited to its maximum capacity This position should be used if the system is used in the 3WAY mode It can also be used along with the Alpha S2 Subbass and in that case there will be a boost in the cross over area The Cross over position is recommended while using the Alpha S2 Subbass 4 WAY mode Your main system will not be as stressed and the tonal balance will be more natural 2 LF Eq The LF Eq trim allows you to tune a shelving filter Fc 500Hz in order to increase or decrease the bass section this trim will act on both M4 amp B1 output This function may be very useful to compensate the coupling effect that vary according to the structure and size of your array The range is 6dB 11 3 LEDs 3 8 Amplifier control The green Senses LED indicates signal presence at sense input on each channel allowing visual control of the return connection from the amplifier output The red Pk LED indicates Peak limiter action reducing exces
13. with Dark Grey carpeting Structured Black coating painting finish also available Handles 2 Metal Bar Handles 4 Metal Bar Handles Front Finish Acoustic Foam on hex perforated steel grid 7796 transparent Flying points 4 Flying Tracks on front 7 positions on Crossbow Flying System cabinet Hardware 2 steps Top to bottom Steel Back plate Optional 4 Flying Tracks on Front R n Internal top to bottom Steel links 4 Flying Tracks on Back Hinge fixing Optional 2 Flying tracks on back Hinge Internal top to bottom Steel links p y Ho 9 Painted Manel annan eymg Tracks Painted version without Flying Tracks also available Fixed Installation The X BOW Flying Tracks can also receive standard Aircraft Flying Fittings 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 Usable Range Data Frequency Response Capability with TD crossover slopes removed b Sensitivity 8 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 ALPHA SERIES USER MANUAL V1 0 DATE 14 01 00 18 27 PAGE 21 37 TECHNICAL SPECIFICATIONS Alpha M3 M8 SYSTEM SPECS ALPHA M3 ALPHA M8 Freguency 190 Hz 19 kHz 3 dB 190 Hz 19 kHz 3 dB Response a Usable
14. 00 110 120 130 140 150 160 170 180 B1 M3 hor 0 0 1 3 5 0 10 0 13 0 14 5 15 8 17 3 18 8 20 0 21 5 22 3 23 5 24 5 23 5 20 5 21 0 18 5 16 8 B1 M8 vert 0 0 1 8 6 0 10 8 12 3 13 0 143 15 5 17 3 18 5 19 5 20 5 215 22 0 228 235 26 3 20 5 16 8 B1 M8 hor 0 0 15 55 9 8 115 125 13 8 153 17 0 18 8 19 5 21 0 22 0 22 3 22 0 20 0 20 8 17 5 16 3 B1 M8 vert 0 0 1 8 6 5 11 0 11 5 12 0 13 3 15 0 16 5 17 8 18 5 20 0 21 0 213 21 8 215 20 5 19 5 16 3 EMEF hor 0 0 2 0 6 3 9 8 9 5 9 5 10 3 11 3 125 13 5 143 15 3 16 5 17 5 18 8 17 3 18 8 19 0 17 0 EMEF vert 0 0 0 8 2 5 5 0 8 0 10 8 13 0 15 3 17 5 19 3 20 3 21 0 215 22 0 23 0 23 0 21 3 19 0 17 0 2000 Hz B1 M3 hor 0 0 13 6 0 14 0 145 16 0 18 3 19 8 21 5 23 3 25 5 27 5 28 5 30 0 30 0 29 8 27 8 27 3 28 0 B1 M8 vert 0 0 1 8 7 0 143 15 8 17 0 20 0 21 8 23 3 24 5 25 8 27 0 28 3 29 0 29 0 29 3 29 5 29 3 28 0 B1 M8 hor 0 0 1 5 5 8 10 5 11 5 11 3 13 5 16 5 205 24 0 25 5 28 0 27 3 27 5 27 5 28 5 27 0 28 5 28 0 B1 M8 vert 0 0 2 3 7 5 12 5 15 0 16 0 18 0 20 5 22 5 24 5 25 8 27 0 28 0 29 0 278 26 8 29 0 29 5 28 0 EMEF hor 0 0 15 45 7 8 7 8 8 0 10 0 12 5 15 5 18 0 19 5 20 0 215 228 23 0 23 8 255 258 24 0 EMEF vert 0 0 18 55 10 5 14 5 16 5 18 3 20 0 22 0 24 0 25 5 26 3 27 0 28 0 29 3 28 0 26 5 25 0 24 0 4000 Hz 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 M3 hor 0 0 2 0 6 5 11 3 16 0 19 5 22 5 25 5 28 8 31 8 34 5 37 3 38 3 39 8 40 5 40 3 40 5 38 0 37 8 M3 vert 0 0 23 6 8 123 165 19 0 225 25 5 29 5 32 0 34 5 36 8 38 3 39 3 39 3 40
15. 0V 5X20mm ALPHA SERIES USER MANUAL V1 0 DATE 14 01 00 18 27 PAGE 19 37 TECHNICAL SPECIFICATIONS TECHNICAL SPECIFICATIONS Alpha S2 SYSTEM SPECS ALPHA S2 with Sub TDcontroller Frequency Response a Usable Range 32Hz 64Hz 3dB 6dB a 29 Hz 180 Hz Sensitivity 1W 105 dB SPL 1m b SPL 1m 140 dB Peak Nominal 3 ohms 2 7 min Impedance Recommended 1800 to 2400 Watts into 3 ohms Amplifiers FEATURES ALPHA S2 Components 2 x 18 46cm long excursion 6 ohms drivers high efficiency acoustic load Height x Width x 1200 x 689 x 754 mm carpet version Depth 47 14 x 27 1 8 x 29 11 16 Shape 22 5 Trapezoid A 85 kg 187 Lb Weight Net With wheel board 95 kg 209 Lb Connectors 1x4 poles Speakon 1 amp 1 Sub S2 Construction Baltic Birch with Dark Grey carpeting Structured Black coating painting finish also available Handles 4 Metal Bar Handles Front Finish Acoustic Foam on hex perforated steel grid 7796 transparent 4 Flying Tracks on front 7 positions on 2 steps Top to bottom Steel Back plate 2 Flying Tracks on Back Hinge fixing Internal top to bottom Steel links Painted version without Flying Tracks also available Flying points Fixed Installation The X BOW Flying Tracks can also receive standard Aircraft Flying Fittings As part of a policy of continual improvement NEXO reserves the right to change specifications without notice a Response Curves and Data Anechoi
16. 2 i SP4 CABLE B1 18 S2 ALPHA SERIES USER MANUAL V1 0 DATE 14 01 00 18 27 Alpha TDcontroller Quick reference guide Full user manual is coming soon l Read before use The Alpha TDcontroller is designed to be used with the Alpha M4 and Alpha B1 speaker cabinets Its main functions are To optimize the response of the system To split the signal into 3 frequency bands LF MF HF e Active protection of the cabinets by dynamic audio signal processing Temperature and Displacement servo control e Reduction of amplifier overload independent Peak limiter function on each channel Alpha TDcontroller also features e Global switchable output level Individual gain control on each channel e High CMRR balanced input e High current drive output stages e User LF EQ e Enhanced protection facility provided for additional safety margin when extended periods of overload are anticipated As with similar devices the Alpha TDcontroller is intended to be inserted between the Audio source console preamplifier etc and the power amplifier WARNING Sense lines MUST be wired in order to ensure the protection of your system Failing to do so may damage your speaker II Front Panel Most front panel functions and indicators are located inside 3 distinct windows left hand areas with upper label Eq 8 ALF relates to functions and indicators dedicated
17. 2 0 2 5 3 3 4 0 4 5 5 0 5 5 6 3 6 0 6 0 5 8 5 3 4 5 4 3 4 0 EMEF vert 0 0 0 0 0 3 0 5 1 0 1 5 2 0 2 8 3 5 4 0 4 8 5 5 6 0 6 0 5 8 5 0 4 5 4 3 4 0 250 Hz Angle dB 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 B1 M3 hor 0 0 0 3 1 0 2 0 3 0 43 5 5 6 8 8 0 8 5 9 5 9 8 9 8 10 0 9 5 8 8 8 0 7 5 7 5 B1 M8 vert 0 0 0 3 0 8 1 5 2 5 4 0 5 3 6 5 7 5 8 5 9 8 10 8 12 0 12 0 11 0 9 8 8 5 8 0 7 5 B1 M8 hor 0 0 0 3 0 8 2 0 3 0 4 3 6 0 7 0 8 0 8 8 9 3 10 0 10 5 10 3 10 0 9 3 8 0 7 5 7 8 B1 M8 vert 0 0 0 3 1 0 1 8 3 0 4 3 5 5 7 0 8 0 9 3 10 3 11 3 12 0 12 0 11 0 9 8 8 8 7 8 7 8 EMEF hor 0 0 0 3 08 18 3 0 4 0 5 3 6 3 7 0 7 8 8 0 8 5 8 8 8 8 8 3 75 6 5 6 0 6 0 EMEF vert 0 0 0 0 0 5 1 0 1 5 2 5 3 3 4 0 4 8 5 5 6 5 75 8 5 8 8 8 8 8 0 7 0 6 3 6 0 500 Hz Angle dB 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 B1 M3 hor 0 0 0 5 2 0 4 5 7 3 9 8 12 0 140 15 8 16 8 17 8 18 8 19 0 18 8 18 5 18 0 17 0 15 0 145 B1 M8 vert 0 0 0 5 2 0 43 6 8 9 3 11 8 13 5 15 0 16 3 17 3 18 3 19 0 20 0 20 5 21 0 19 3 16 0 145 B1 M8 hor 0 0 0 5 2 0 4 3 6 5 9 0 12 0 140 16 3 17 8 18 5 19 0 19 3 19 5 19 5 19 5 17 5 15 5 15 8 B1 M8 vert 0 0 0 5 2 0 4 0 6 5 8 8 11 3 13 5 15 5 16 8 175 18 3 19 3 20 5 215 21 8 19 5 16 5 15 8 EMEF hor 0 0 05 20 40 65 9 3 11 8 14 0 15 8 17 0 17 0 17 3 17 8 18 0 17 8 16 3 143 12 5 12 0 EMEF vert 0 0 0 3 1 0 1 8 3 0 4 5 6 0 7 5 8 8 10 0 11 0 11 3 12 0 13 0 15 0 16 3 145 128 12 0 1000 Hz Angle dB 0 10 20 30 40 50 60 70 80 90 1
18. 6 23 PAGE 35 37 TRANSPORT TRANSPORT lt lt gt 91 gt o IS 9 Y 3 3 Y W w O eo ALPHA SERIES USER MANUAL V1 0 DATE 14 01 00 16 23 PAGE36 37 CONNECTIONDIAGRAMS Connection Diagrams SP4 CABLE 69 55 0 1 Ly2XN lt 0 52 49 64 09011 LYZXN SP4 CABLE 81 14 8 8dS 8 8dS of jo Jejoquooq 8 3 8dS 9 SUIUO 9 OJUI SHEM 006 3 8 848 81 19 VHd V SUIYO 8 OJUI SHEM 0001 002 WA VHd IV od 2 SIaIIdu y pepueuluooeH
19. E 9 37 GENERAL SET UP INSTRUCTIONS TDcontrollers settings The Alpha Series cabinets will not perform correctly without their associated TDcontrollers Sound quality and reliability are totally dependent on the correct use of the TDcontrollers in association with the Nexo instructions provided All manuals 8 associated technical notes must be read before set up Please contact your NEXO agent for any literature inguiry NX241 Digital TDcontroller The digital NEXO NX241 controller is able to drive the entire current Nexo range PS 8 Alpha series The following set ups are supported at the time of publication Alpha Series ALPHATD B1 M3 Configure Input A to drive a 3 Way Alpha System ALPHATD S24B1 M3 Configure Input A to drive a 4 Way Alpha System SubTD S2 63Hz ALPHATD S2 B1 M3 Configure Input A to drive a 4 Way Alpha System SubTD S2 80Hz ALPHATD S2 B1 M3 Configures Input B right to drive the SUB channel independently S2 63Hz AUX inB ALPHATD S2 B1 M3 Configures Input B right to drive the SUB channel independently S2 80Hz AUX inB Alpha E Series AlphaE STEREO Configures 2 passive Alpha EM 2 B1 18 or 2 Alpha EF in stereo AlphaE MONO Configures Input A to drive 1 passive Alpha EM B1 18 S2 sub cabinet Channel 4 is unused Very important Due to the DSP processing time analogue Sub TDcontroller Alpha TDcontroller AlphaE TDcontroller are incompatible with the Digital NX241and should neve
20. NEXO ALPHA SERIES Alpha M3 amp M8 Alpha Em amp EF B1 18 amp B1 15 S2 Sub bass User Manual INTRODUCTION PAGE 2 37 INTRODUCTION ALPHA SERIES DESCRIPTION LOUDSPEAKERS NEXO TDCONTROLLERS THE X BOW FLYING SYSTEM GENERAL SET UP INSTRUCTIONS SPEAKER WIRING FLYING THE SYSTEM TDCONTROLLERS SETTINGS INITIAL SET UP PRECAUTIONS ALPHA ARRAYS SOME BASIC RULES ALPHA S2 PLACEMENT SPL VERSUS FREOUENCY SPL VERSUS DISTANCE DIRECTIVITY COVERAGE AMPLIFIERS POWER CURRENT RATING AMPLIFIER GAINS GAIN VALUE ADVANCED PROTECTIONS PASSIVE CROSSOVER FUSES TECHNICAL SPECIFICATIONS ALPHA S2 ALPHA B1 15 B1 18 ALPHA M3 M8 ALPHA EM EF DIRECTIVITY TABLES CURVES ALPHA S2 ALPHA B1 18 ALPHA B1 15 ALPHA M3 ALPHA M8 ALPHA EM ALPHA EF DIMENSIONS TRANSPORT CONNECTION DIAGRAMS 35 36 ALPHA SERIES USER MANUAL V1 0 DATE 14 01 00 18 27 PAGE 3 37 INTRODUCTION INTRODUCTION Thank you for selecting NEXO Alpha Series This manual is intended to provide you with necessary and useful information about your Alpha System S2 B1 15 B1 18 M3 M8 EM EF Please devote some attention to reading this manual A better understanding of some specific features of the Alpha Series will help you to operate your system to its full potential This manual is intended to be comprehensive and we hope that it will satisfy your requirements Should you require further information ple
21. WIR Alpha Controle 05 Alpha MES Ohm 3v d AVEC VM NAA 10 00 10 i i LH e Figure 7 Frequency Response with Alpha TDcontroller dB e Figure 8 Impedance Ohms Black MF Grey HF Index 48 E Alpha NS FE Eese Ang Alpha M Degree 100 NS 10 000 10 N 5 0000 e Figure 9 Directivity Index dB and Factor e Figure 10 Nominal Coverage 6 dB Degrees 10 00 y 10 00 HH LR E IAN l am e Figure 11 Horizontal Off Axis e Figure 12 Vertical Off Axis Frequency Response 10 20 amp 30 Frequency Response 6 10 20 amp 30 Frequency Response Curves Anechoic Far Field above 200 Hz Half space Anechoic below 200 Hz Impedance Voltage to Current Ratio Free Field measurement Off Axis Frequency Response 1 3 octave smoothed frequency response normalised to On Axis response Directivity Curve Coverage Angle and Polar Diagram from computer processing on off axis response curves ALPHA SERIES USER MANUAL V1 0 DATE 14 01 00 18 27 PAGE 26 37 CURVES Alpha M3 Horizontal Directivity 5dB div ALPHA SERIES USER MANUAL V1 0 DATE 14 01 00 18 27 PAGE 27 37 CURVES
22. ase contact your NEXO agent Alpha Series description Loudspeakers The Alpha range includes the following speakers The S2 Sub bass is a double 18 inch resonator loaded sub bass dedicated to very low frequency reproduction 80 Hz The B1 15 amp B1 18 are complex loaded bass reflex amp exponential horn bass cabinets the B1 15 houses one 15 inch driver while the B1 18 houses one 18 inch driver frequency response ranges from 40 Hz up to 200 Hz The Mid high M3 amp M8 are concentric horn cabinets dedicated to the 200 Hz 20 kHz frequency range reproduction the MF range is handled by two exponential horn loaded 10 inch drivers whose response is optimised by two Nexo designed phase plugs the HF range is handled by one constant directivity horn loaded two inch Neodymium driver M3 coverage is 35 H x 35V M8 75 H x45 V The Mid high EM forms part of the recently introduced Alpha E Series its size and power rating is smaller than that of the Alpha M3 amp M8 the mid range is handled by an exponential horn loaded 10 driver while the HF range is handled by a constant directivity horn loaded ceramic 2 driver Alpha EM coverage is 5 X30 The compact EF is dedicated to the full audio range reproduction 40 Hz 20 kHz it consists of one EM and one B1 18 stacked in a monoblock compact format Alpha cabinet formats are designed for optimal array assembly see section DIMENSIONS p 34 all the cabinets have
23. c Far Field above 200 Hz Half space Anechoic below 200 Hz Usable Range Data Frequency Response Capability with TD crossover slopes removed D Sensitivity 8 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 ALPHA SERIES USER MANUAL V1 0 DATE 14 01 00 18 27 PAGE 20 37 TECHNICAL SPECIFICATIONS Alpha 81 15 B1 18 5 5 ALPHA B1 15 Frequency Wideband 42 Hz 180 Hz 3 dB Response a Xover 80 Hz 190 Hz 3 dB Usable Range n 6dB a 39 Hz 600 Hz 1W 106 dB SPL 107 dB SPL Nominal u SPL Q 1m 140 dB Peak 142 dB Peak Nominal pem 6 ohms 5 2 mini 6 ohms 4 7 mini REC 900 to 1200 Watts into 6 ohms 900 to 1400 Watts into 6 ohms ALPHA B1 18 40 Hz 230 Hz 3 dB 38 Hz 600 Hz Amplifiers FEATURES ALPHA B1 15 ALPHA B1 18 Components 1x15 38 cm 6 ohms 1x18 46 cm 6 ohms Folded Horn Composite Curve Folded Horn Composite Curve Height x Width x 600 x 689 x 754 mm 800 x 689 x 754 mm Depth 23 5 8 x 27 1 8 x 29 11 16 31 49 x 27 1 8 x 29 11 16 Shape 22 5 Trapezoid Weight Net 51 kg 112 Lb 69 9 kg 155 Lb With wheel board 58 kg 128 Lb With wheel board 79 kg 175 Lb Connectors 1 8 1 Sub S2 2x 4 poles Speakon In Out 2 amp 2 Bass B1 Construction Baltic Birch
24. ections will be set for normal operation This is the factory set position When turned fully clockwise marked protections will be increased e g this setting should be used where the system is operating under harsh conditions identical gain for each amp is not checked Intermediate positions of the trimmer can also be used and will be recommended in cases of extended periods of overload e g in some discotheque applications V Setting Up Advice V 1 Recommendations for wiring the Sense lines The impedance of the sense inputs of the TDcontroller being quite high the currents are low and therefore ordinary line cable can be used If the unit is housed in the amp racks an unshielded cable can be used Release 0 Date 03 12 99 Quick ref guide Alpha TDcontroller NN PAN USA NEXO USA Inc 2165 Francisco Blvd Suite E2 San Rafael CA 94901 Tel 1 415 482 6600 Fax 1 415 482 6110 Email nexousa aol com France NEXO S A 154 All e des Erables ZAC de PARIS NORD II BP 50107 F 95950 ROISSY CDG CEDEX Tel 33 1 48 63 19 14 Fax 33 1 48 63 24 61 Email infoQnexo fr UK NEXO limited 9 Lyon Road Walton on Thames Surrey KT12 3PU Tel 44 1932 886 007 Fax 44 1932 886 008 Email info nexo sa com FAR EAST NEXO Far East Ltd 101 Lorong 23 Geyland 06 04 Prosper House Singapore 388399 Tel 65 742 5660 Fax 65 742 8050 Email info nexo sg com
25. el at 2 meters will be 94 dBSPL 80 dBSPL at 10 meters and so on Note that under these conditions of small source and open air the sound pressure level will be decreasing by 6 dB when doubling the distance Straight Vertical Array long throw Some open air applications might reguire loud level on a wide freguency range at a long distance It is then recommended to stack a large number of Alpha M3 M8 EM vertically Up to a determined distance function of the freguency and the height of the stack the sound wave is cylindrical 3dB 2d it becomes progressively spherical 6dB 2d above that distance f e Transition from cylindrical to spherical wave front Sound Pressure Level dBSPL distance meters 110 00 ras 20 909 Ta Kati AILI 70 000 1 nn Ap 60 000 ALPHA SERIES USER MANUAL V1 0 DATE 14 01 00 18 27 PAGE 13 37 ALPHA ARRAYS SOME BASIC RULES Hygrometry and Temperature Air Absorption Under usual conditions air absorption increases when relative humidity decreases and increases when temperature decreases Air absorption gives a linear attenuation i e a constant value of loss of dB per meter if 1 dB is lost from 10 to 20 meters 2 dB will be lost from 20 to 40 meters 4 dB from 40 to 80 meters and so on The tables below list these values for normalised frequencies and various values of relative humidity and tempe
26. er doubling i e for n Alpha M3 M8 EM or EF 10 log10 n lt LGSPL 100Hz 1kHz lt 20 log10 n e At high frequencies wavelength being short in relation to the size of the cabinet the gain level is smaller no gain will be obtained for cabinets angled at their nominal coverage maximum gain will be obtained for n cabinets pointing in the same direction Therefore the gain will range from 0 to 3 dB per doubling for n Alpha M3 M8 EM or EF 0 lt LGSPL 1kHz 10kHz lt 10 log10 n SPL Versus Distance In open air conditions the level of sound at a given distance is related to the following parameters e The size and the geometry of the source which determines the shape of the sound wave spherical cylindrical plane e Hygrometry and temperature viscosity of the air and thermal conduction cause an energy loss increasing with frequency This phenomenon is referred to as excess attenuation ALPHA SERIES USER MANUAL V1 0 DATE 14 01 00 18 27 PAGE 12 37 ALPHA ARRAYS SOME BASIC RULES Single Cabinet Lp 1m being the sound pressure level at 1m the level at a distance d in meters is given by Lp d Lp 1m 20 logio d BS Sound Pressure Level dBSPL distance meters A 110 00 PS 100 00 90 000 NE 80 000 PRA 70 000 m 60 000 1 10 100 Single Cabinet SPL versus Distance For example if the level measured at 1 meter is Lp 1m 100 dBSPL the lev
27. ervo control system cabinets will NOT BE PROTECTED AT ALL if the sense lines are not connected l11 6 Voltage selector According to CEI65 and UL1419 norms an external voltage selector is provided at the back of the unit It will allow the controller to works under both normalized voltage 230V and 115V WARNING Changing the voltage rate means also changing the fuse and power cord Safety norms concerning cables are changing according the voltage Ill 7 Fuse holder When necessary the fuse should be replaced in any case by a fuse of the same rating e for 230V T100mAL250V for115V T200mAL250V Release 0 Date 03 12 99 Quick ref guide Alpha TDcontroller NN A p 4 Error Style not defined IIL8 Mains Socket WARNING This appliance must be earthed The socket is compatible with mains supply flexible cords which comply with IEC Publication 227 IV Functions requiring the opening of the TDcontroller IV 1 Enhanced protection trimmers The embedded trimmers Red wheel are used to change the thresholds of the protection system TR13 affect the threshold of the HF active and Right passive protections TR15 affect the threshold of the LF active and Left passive protections TR18 affect the threshold of the SUB protections It is not recommended to increase the threshold Marked as the protections will be lowered In the mid position the speaker prot
28. f 2 and modulating at high level 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 Amplifier gains Technical knowledge on the amplifiers to be used with the system is essential This data is the key to the correct alignment of the system It is especially important to know the gain of all amplifiers used in your set up The tolerance shall 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 voltage gain for each model For example a range of amplifiers with different power outputs 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 only fixed input sensitivity 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
29. ienced persons to handle X BOW flying systems Installation personnel should be trained in loudspeaker flying technigues and should be fully conversant with this manual 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 the local safety standards applicable to the territory Do not fly the system over areas to which the audience has access Ensure that the system is secure and prevented from pivoting about the motor hoist Avoid any form of dynamic loading to the assembly NEVER attach any item to the X BOW other than the NEXO X BOW accessories When flying outdoor systems ensure that the system is not exposed to wind or snow loads and is protected from rainfall The X BOW requires regular inspection and testing by a competent test centre NEXO recommend that the system
30. 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 X BOW components carefully to prevent damage in transit 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 UK and International training agencies can be obtained by contacting The Production Services Association PSA School Passage Kingston upon Thames KT1 SDU Surrey ENGLAND Telephone 44 0 181 392 0180 Ground Stack 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 ALPHA SERIES USER MANUAL V1 0 DATE 14 01 00 18 27 PAGE 8 37 GENERAL SET UP INSTRUCTIONS 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 X BOW components should be used to stabilise ground stacks and to ensure that cabinets remain securely registered to each other The X HINGE can be used to connect Alpha cabinets both vertically and horizontally at the rear and horizo
31. lifier is attenuated and the slave amplifiers are not severe system damage will result ALPHA SERIES USER MANUAL V1 0 DATE 14 01 00 18 27 PAGE 11 37 ALPHA ARRAYS SOME BASIC RULES Alpha Arrays Some Basic Rules The concept of arraying speakers derives from two requirements e Increased sound pressure level e Extended coverage area Array behaviour is very complex and a bad design can lead to very poor results The Alpha system was designed to be flexible allowing the user to optimise the design for a dedicated situation its development included a long measurement program on a very large variety of arrays Below are some simple rules that the user should respect Alpha S2 Placement The nominal efficiency data for Alpha S2 is given for when positioned on the floor half space When flown the acoustic output on axis will be 3 dB lower and if positioned in a corner the acoustic output on axis will increase by 3 dB SPL Versus Frequency Array frequency response is strongly related to wavelength and array architecture e low frequencies wavelength being very large in relation to the size of the cabinets speakers set close to each other will always radiate in phase The gain in sound pressure level LGSPL will be of 6 dB per doubling i e if n Alpha S2 or B1 are installed LGSPL 20Hz 100Hz 20 log10 n e n the mid frequency range the gain depends on the configuration of the array and will range from 3 to 6 dB p
32. ntally at the front edge In addition the Fly Track can be used as a connection point for a safety wire to a secondary structure 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 likely effect upon the system prior 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 ALPHA SERIES USER MANUAL V1 0 DATE 14 01 00 18 27 PAG
33. offset integration limiter compressor These functions are not adapted to specific system reguirements and may interfere with the complex protection algorithms used in the NX241 NEXO do not advise using other protection systems in conjunction with the NX241 and they should be disabled ALPHA SERIES USER MANUAL V1 0 DATE 14 01 00 18 27 PAGE 18 37 PASSIVE CROSSOVER FUSES PASSIVE CROSSOVER FUSES Please note within both Alpha amp AlphaE cabinet families a fuse is fitted to protect the internal passive filter network in the event of a voice coil failure This fuse is located on the filter network which is attached to the input panel of the following cabinets e Alpha M3 8 cabinets e Alpha EM series cabinets e Alpha EF series cabinets It is vital that this fuse is checked at regular service intervals and especially when replacing any loudspeaker components If the fuse fails it will not prevent the cabinet from functioning but should the cabinets be operated in this condition the audio quality will be seriously degraded Failure to replace a defective fuse will cause a difference in audio quality between fully operational cabinets and those with defective fuses It is very important to replace the fuse with exactly the same type and value as the original fitted to the cabinet The various fuse specifications are e Alpha M3 8 cabinets T1 25A 250V 5X20mm Alpha EM F MF T6 3A 250V 5X20mm e Alpha EM F HF T5A 25
34. olar plots will show dips and lobes The amplitude of these lobes will depend on the directivity of the individual sources and on their angulations Small Arrays less than 4 Alphas M3 M8 The amplitude of the dips and the lobes is minimised when angling the cabinets at their nominal coverage angle If the angle is less than the coverage the interference region will be larger and if the angle exceeds that value there will be a hole between the cabinets It is therefore strongly recommended when using a small amount of cabinets to angle them at their nominal coverage angle Alpha M3 35 x35 M8 75 x 45 EM EF 75 x 309 ALPHA SERIES USER MANUAL V1 0 DATE 14 01 00 18 27 PAGE 15 37 ALPHA ARRAYS SOME BASIC RULES The only situations where such arrays can be assembled with very little angle are long throw applications very small vertical coverage because the interferences are less significant at large distances from the array Large Arrays 4 Alphas M3 M8 and above Construction of large arrays derives from important SPL requirements rather than large listening angles although the Alpha M3 is a high Q cabinet 4 boxes are enough to cover a 140 horizontal plane Therefore large arrays will usually assemble cabinets at less than their nominal coverage angle Measurements and simulations show that when using a large amount of cabinets the individual behaviour of a cabinet will determine the roll off on the limit
35. plied between pins 2 and 3 pin 1 being grounded As a result of the balanced nature of the outputs and providing that balancing is respected by way of the connection to the amplifier there is no hot or cold pin the TDcontroller being neutral regarding the polarity of the signal 11 2 Earth Lift The push button labeled Earth Lift allows connection depressed position or disconnection out position between the signal ground and the mains earth which is itself linked to the chassis Using this button may help to eliminate hum due to ground loops created in the system 3 Audio Outputs The audio outputs are the three 3 pin male XLRs located in the area labeled Audio OUT Signal is applied between pins 2 and 3 pin 1 being connected to ground When used with an amplifier with balanced inputs Amplifier the wiring of the output XLR is simply pin to pin 1 to 1 etc the polarity of the signal being thus respected if the source connected to the input is also balanced 111 4 Output Level Switch The three gain values available are 10 6 0 dB 6dB is the recommended factory setting 111 5 Sense inputs The sense inputs of the three channels are arranged on a six pole barrier strip set into the rear panel within the area labeled Sense IN The Sense inputs are intended for the output signals of the amplifiers driving one cabinet each of the channel being used Input sense connection is obligatory for proper operation of the s
36. r be used in conjunction to control cabinets within the same array ALPHA SERIES USER MANUAL V1 0 DATE 14 01 00 18 27 PAGE 10 37 GENERAL SET UP INSTRUCTIONS Initial Set up Precautions When running up a system particularly one which includes brand new cabinets for the first time the power should be increased slowly to approximately 50 and the system operated at this level for two hours During the following two hours of operation the power level should be limited to approximately 75 This procedure allows the adhesives and suspensions within the loudspeaker components to stabilise and will extend their working life In all cases it is advisable to connect the loudspeakers only after all the other components have been wired and are operating correctly This is particularly important for the amplifiers and the TDcontroller It is a good practice to turn down all the amplifier gains before connecting the cabinets and then turn them up again individually with a medium level music source fed into the system The sense LEDs of the corresponding TDcontroller channel should light up accordingly This will help to locate cabling errors particularly channel line inversions which would disable the TDcontroller protections and may invalidate the warranty IMPORTANT If more than one amplifier is being driven from an output of the NX241 controller only those amplifiers which are not connected to sense inputs may be attenuated If the sensed amp
37. rature At 20 C dB loss meter Up to 1 kHz 2 kHz 4 kHz 8 kHz 16 kHz 0 02 o o2 oss o om 008 08 RH 80 o 00 02 o Frequency Hz Attenuation dB 10 000 0 0 KS 10 00 NS 20 00 MI 30 00 40 00 2 100 1k 10k 20k Air absorption over a 50m distance RH 20 50 80 At RH 50 dB loss meter Up to 1 kHz 2 kHz 4 kHz 8 kHz 16 kHz 05 009 02 9 0 01 1 00 109 AUDIO PRECISION LEVEL dBV vs FREQ Hz 17 JUL 97 19 30 05 10 000 Ap 0 0 M 10 00 NS 20 00 30 00 40 00 20 100 1k 10k 20k Air absorption over a 50m distance t 10 C 20 C 30 C The speed of sound C varies with temperature according to the formula below C 20yt 273 Where t is the temperature in C The delay time between two sources spaced at a distance d is then At C d ALPHA SERIES USER MANUAL V1 0 DATE 14 01 00 18 27 PAGE 14 37 ALPHA ARRAYS SOME BASIC RULES Directivity Coverage The two main qualities one might expect from a cabinet for array constructions are e A good directivity control in the mid and high frequency region which guarantees the steadiness of the interference region where dips and lobes occur e A st
38. rong roll off of the directivity function at the 6dB cut off angle which minimises the size of the interference region The Alpha series cabinets were designed to respect these two criteria Particularly the Alpha M3 features a constant coverage angle 5 from as low as 800 Hz up to 12 kHz with high values of dB loss degrees at cut off angle Directivity of Multiple Sources What HAPPENS In order to understand the coverage behaviour of combined sources wavelength must be related to the space between sources The wavelength in meters of o sine wave is determined by Ch where fis the frequency of the sine wave This gives A 20Hz 17 m A 100Hz 3 4 m A 1kHz 34 cm and A 20kHz 1 7 cm Interference The distance between sources generates a path n A length difference between the two signals that is nil x El ON i difference on axis and increases with the listening angle If this path length difference increases to half the wavelength in a specific direction the two signals will cancel in that direction This phenomenon is often described as interference Resulting directivity At low freguencies because wavelength is much larger than the spacing between sources interference is generally not significant However the directivity index will increase In the mid and high freguency range where wavelength is comparable to spacing between sources the directivity p
39. s flying system enables efficient array assembly with minimum space between cabinets thus reducing edge diffraction The X BOW flying system includes four main components references are e ALXBOW main chassis 1 ALXKIT hinge 1 and cable links 2 e ALXBRIDLE D ring 1 and leg chains 3 e flight case for a complete X BOW flying kit capacity 4 X BOWs ALPHA SERIES USER MANUAL V1 0 DATE 14 01 00 18 27 PAGE 5 37 GENERAL SET UP INSTRUCTIONS General Set up Instructions Speaker Wiring Connectors The loudspeakers are connected via SPEAKON connectors NLAFC and NL8FC not supplied A wiring diagram is printed on the connection panel located on the back of each cabinet The pins of the SPEAKON sockets are identified in out and connected in parallel within the enclosures A single 8 conductor cable carries all four bands required by the Alpha M3 B1 S2 system and the cabinet connectors allow all three types of cabinet to be safely linked at the loudspeaker end See Connections Diagrams at the end of this manual NB The Alpha S2 back panel features only one 4 pin SPEAKON connector in order to prevent accidental parallel connection very few amplifiers are able to drive such low impedance loads at the required power level S2 B1 15 B1 18 M8 EM EF To VLF 82 To VLF 82 To VLF 82 Not In Out LF B1 To LF B1 To LF B1 MI AE HE a 66 66 6 6 po
40. s of the coverage zone and the architecture of the array will be responsible for the behaviour in the coverage zone For examples of suitable cabinet configurations please refer to the Alpha System Flying Manual and to subsequent technical notes ALPHA SERIES USER MANUAL V1 0 DATE 14 01 00 18 27 PAGE 16 37 AMPLIFIERS Amplifiers Power NEXO recommends high power amplifiers in all cases Budget constraints are the only reason to select lower power amplifiers If an incident occurs on an installation without protection the fact that amplifiers only generating half their rated output power 3dB 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 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 much higher instantaneous current than its nominal impedance would indicate four to ten times more Amplifiers are generally specified by continuous RMS power into resistive loads however the only useful information in that respect is the specification into a 2 ohm load It is possible to make an amplifier listening test by loading them with twice the number of cabinets considered for the application 2 speakers per channel instead of one 4 instead o
41. sive peak voltage or levels capable of overloading the amplifier 3 5 Protection indicator Yellow LED lighting up indicates that temperature or displacement protections are in action on the relevant channel Il 3 c Power LED At the leftmost extremity of the TDcontroller a green LED shows if the unit is powered 11 4 Peak Limiter adjustments The Alpha TDcontroller features three independent peak limiter trims which allows you to tune the peak limiter according to the power of the amp The peak limiter has no real protection function it must be tuned to avoid the clipping of the amp which could generate some strange artifacts To set the peak limiter at the correct value you can either turn the trimmer clockwise until the red LED lights at the same time that the clipping LED of the amp or use the graduation power value given under 8Q IL5 Gain control Three 12 dB range trimmers are provided to set the gain each channels This gain control is useless if you are using amplifiers having the same gain If you re using constant sensitivity 1 4V or 0 7V with different amps powers you will have to correct the gain difference between the amplifiers The factory position is mid detent which correspond to a 0 dB gain Release 0 Date 03 12 99 Quick ref guide Alpha TDcontroller AN PAN Error Style not defined p 3 Ill Rear Panel 7 Audio Inputs Signal is ap
42. that can be fitted with NEXO X BOW flying accessories The X BOW Flying Manual must be thoroughly read before flying the system The following points are designed to remind the user of safe practice when flying the X BOW System They cannot address every possible circumstance in which the system might be deployed therefore the user must always apply his or her knowledge experience and common sense If in any doubt seek advice from your NEXO agent Flown Systems Safety e Always inspect all the X BOW components and cabinet Fly Rails for damage before assembly Pay special attention to the lifting points trombone sockets 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 the X BOW Flying manual carefully Also be familiar with the manuals and safe working procedures for any ancillary equipment which will be used with the X BOW System such as hoists steel wires and other rigging components 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 the X BOW system always wear protective headwear footwear and eye protection ALPHA SERIES USER MANUAL V1 0 DATE 14 01 00 18 27 PAGE 7 37 GENERAL SET UP INSTRUCTIONS Do not allow inexper
43. the same width and depth height is in multiples of 200 mm UNITS Six UNITS 1200 mm Alpha S2 Alpha EF Four UNITS 800 mm Alpha B1 18 ALPHA SERIES USER MANUAL V1 0 DATE 14 01 00 18 27 PAGE 4 37 ALPHA SERIES DESCRIPTION e Three UNITS 600 mm Alpha B1 15 Alpha Alpha Two UNITS 400 mm Alpha EM Nexo TDcontrollers The Alpha Series speakers are associated with the NX241 Digital TDcontroller which can be configured to provide comprehensive control of the above mentioned cabinets For a complete description of this unit please refer to the NX241 User Manual You may also use one of the following analogue TDcontrollers that preceded the NX241 Please refer to the corresponding user manual or contact your NEXO agent for more information on these products e Sub TDcontroller for use with Alpha S2 e Alpha TDcontroller for use with Alpha B1 15 B1 18 M3 8 M8 e AlphaE TDcontroller for use with Alpha B1 18 EM 8 EF This manual will only refer to the NX241 TDcontroller Please remember that the NX241 Digital TDcontroller is a software based product for which regular updates will be published Please consult the NEXO web site for the latest software releases The X BOW flying system The design of the X BOW flying system has been optimised for the dispersion specifications of the Alpha range its mechanical characteristics match accurately the acoustical properties of the speakers The concept of thi
44. top to bottom Steel links Painted version without Flying Tracks also available Fixed Installation The X BOW Flying Tracks can also receive standard Aircraft Flying Fittings 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 Usable Range Data Frequency Response Capability with TD crossover slopes removed D 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 normalised to On Axis response Data obtained by computer processing on off axis response curves ALPHA SERIES USER MANUAL V1 0 DATE 14 01 00 18 27 PAGE 22 37 TECHNICAL SPECIFICATIONS Alpha EM EF SYSTEM SPECS ALPHA EM ALPHA EF Frequency Response a Usable Range 220 Hz 19 kHz 3 dB 40 Hz 19 kHz 3 dB 6dB a 180 Hz 20 kHz 6 dB 38 Hz 20 kHz 6 dB Sensitivity 1W 1m b Peak SPL 1m b Dispersion c 107 dB SPL 107 dB SPL LF 142 dB Peak 140 dB Peak MF HF 140 dB Peak 75 x 30 75 x 30 Directivity Q amp DI Ic Hz A 25 DI 14 dB Nominal f gt 630 Q 25 DI 14 dB Nominal f gt 630 Hz Cross Over i
45. ure 1 Frequency Response with Sub TDcontroller dB e Figure 2 Impedance Ohms Alpha B1 18 On Axis Response Alpha B1 18 With AlphaETD Controller dB Impedance Alpha B1 18 Ohm 10 000 50 oo FAC 20 00 30 00 2 30 e Figure 3 Frequency Response with AlphaE TDcontroller dB e Figure 4 Impedance Ohms Alpha B1 15 On Axis Response Alpha B1 15 With AlphaTD Controller Overlap X over Impedance Alpha B1 15 Ohm 10 000 50 Ap 7 0 0 TA 10 00 10 20 00 30 00 30 e Figure 5 Frequency Response with Alpha TDcontroller dB e Figure 6 Impedance Ohms Black Overlap Mode Grey X Over mode Frequency Response Curves Anechoic Far Field above 200 Hz Half space Anechoic below 200 Hz Impedance Voltage to Current Ratio Free Field measurement Off Axis Frequency Response 1 3 octave smoothed frequency response normalised to On Axis response Directivity Curve Coverage Angle and Polar Diagram from computer processing on off axis response curves ALPHA SERIES USER MANUAL V1 0 DATE 14 01 00 18 27 PAGE 25 37 CURVES Alpha M3 ons Response Alpha
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