SCREEN SERIES SSA 100
Contents
1. Weight 17 7 kg 39 lb Housing 19 in rack mount 2 HU high 410 mm 16 1 in deep behind the mounting surface without connectors Dimensions h x w x d 88 x 482 x 415 mm without connectors and rack handles 5 25 x 19 0 x 16 3 in 7 SNOILVOlsIDAdS A NEW WORLD OF SOUND e stage accompany SSA 100 USER MANUAL 7 Warranty New Stage Accompany B V warrants to the initial purchaser of each new Stage Accompany product from the date of purchase by the original purchaser until the end ofthe warranty period that the product is free of defects in materials or workmanship The warranty period on all Stage Accompany products is five years from the date of the first consumer purchase with the exception of all electrical products three years from the date of the first consumer purchase e cone assemblies in the loudspeaker and diaphragms of the Ribbon Compact Drivers one year from the date of the first consumer purchase e movable parts such as castors locks handles hinges fans etc one year from the date of the first consumer purchase computers and associated peripherals six months from the date of the first consumer purchase To validate warranty the purchaser must always keep the original receipt of purchase to establish the date of purchase Appeal on warranty will be voided in case e of defects caused by influence from the outside accident misuse neglect or influence of water2. the serial number on the product has been defaced altered or removed il ALNVYYVM of damage due to shipment of damage resulting from neglecting instructions listed in the user manual of damage caused by incorrect abnormal handling or abuse during delivery e the unit has been repaired or shows signs of repair by someone not authorised by New Stage Accompany B V e the original receipt of purchase cannot be presented whenever warranty service is re quired the cause of damage is unknown A NEW WORLD OF SOUND e stage accompany uN SSA 100 USER MANUAL Shipment of the product to an authorised Stage Accompany service centre is at the risk and responsibility of the customer New Stage Accompany B V will pay for all labour and material expenses for all repairs covered by the warranty New Stage Accompany B V will not pay for the costs of shipment to the service centre or factory However New Stage Accompany B V will pay for the costs of return shipment to the customer if repairs are covered by warranty Caution Warranty work can only be performed at authorised Stage Accompany service centres or at the Stage Accompany factory Every repair or attempted repair by a non authorised party will void the warranty New Stage Accompany B V reserves the right to alter specifications without prior notice i ALNVYYVM A NEW WORLD OF SOUND EN SSA 100 USER MANUAL o stage accompany 8 Overvie
3. you have a reliable well earthed power source The required current for the SSA 100 can be found in the table in paragraph 3 1 Connect the SSA 100 to your signal sources via the lt INPUT gt connectors Or connect the SSA 100 to your booth monitor using the 15 pin D type Data Port connector H NOILONGOULNI A9INO Connect your speaker system via the lt OUTPUT gt connectors Never make connections to the amplifier or to any preceding equipment with the ampli fier switched on Select the desired gain by means of the lt GAIN CONTROLS gt Switch the SSA 100 on using the lt POWER ON OFF gt switch Any earth hum that may be present may be solved with the lt GROUND LIFT gt switch The SSA 100 is now ready for use A NEW WORLD OF SOUND e stage accompany SSA 100 USER MANUAL 2 Introduction The Stage Accompany SSA 100 is a dual channel high efficiency power amplifier and comprises the following components e Balanced input stages e D type connector for easy connection to Cinema Booth Monitor e Two high efficient amplifiers which deliver each 290 Wrms into 8 Q 425 Wrms into 4 Q and 525 Wrms into 2 Q or 340 W peak into 8 Q 535 W peak into 4 Q and 700 W peak into 2 Q e Advanced protection circuits a NOILONGOULNI The SSA 100 is protected against the connection of speaker impedances less than 2 Q or even short circuiting of the output In these cases the output current is limited but the amplifier ke
4. 6 5 0 3 4 2 1 1 3 Table 3 4 Proportional power loss as a function of loudspeaker cable gauge and cable length A NEW WORLD OF SOUND an e stage accompany SSA 100 USER MANUAL Cable Gauge mm 8 Q 1 5 2 5 3 0 4 0 6 0 10 0 16 0 20 5 4 3 3 2 8 2 1 1 4 0 8 0 5 Cable Length 30 7 8 4 9 4 1 3 1 2 1 1 3 0 8 m 40 10 2 6 4 5 4 4 1 2 8 1 7 1 1 50 12 4 7 8 6 6 5 0 3 4 2 1 1 3 100 22 1 14 5 12 4 9 6 6 6 4 1 2 6 Table 3 5 Proportional power loss as a function of loudspeaker cable gauge and cable length Cable Gauge mm 40 1 5 2 5 3 0 4 0 6 0 10 0 16 0 20 10 2 6 4 5 4 4 1 2 8 1 7 1 1 Cable Length 30 14 5 9 3 7 8 6 0 4 1 2 5 1 6 m 40 18 5 12 0 10 2 7 8 5 4 3 3 2 1 50 22 1 14 5 12 4 9 6 6 6 4 1 2 6 100 36 2 25 4 22 1 17 5 12 4 7 8 5 0 Table 3 6 Proportional power loss as a function of loudspeaker cable gauge and cable length Cable Gauge mm 20 1 5 2 5 3 0 4 0 6 0 10 0 16 0 10 10 2 6 4 5 4 4 1 2 8 1 7 1 1 20 18 5 12 0 10 2 7 8 5 4 3 3 2 1 Cable Length 30 25 4 16 4 14 5 11 3 7 8 4 9 3 1 m 40 31 2 21 4 18 5 14 5 10 2 6 4 4 1 50 36 2 25 4 22 1 17 5 12 4 7 8 5 0 100 53 1 40 5 36 2 29 8 22 1 14 5 9 6 Table 3 7 Proportional power loss as a function of loudspeaker cable gauge and cable leng
5. SSA 100 USER MANUAL stage accompany SCREEN SERIES SSA 100 High Efficiency Cinema Power Amplifier User Manual A NEW WORLD OF SOUND e stage accompany pa SSA 100 USER MANUAL Published by New Stage Accompany B V Training amp Documentation Anodeweg 4 1627 LJ Hoorn The Netherlands Copyright 2001 by New Stage Accompany B V All rights reserved No part of this manual may be reproduced or transmitted in any form or by any means electronically or mechanical without written permission from New Stage Accom pany B V except for the inclusion of brief quotations in a review First printing May 2001 Printed in The Netherlands This manual is intended to provide information about the Stage Accompany SSA 200 Every effort has been made to make this manual complete and as accurate as possible However no warranty of suitability purpose or fitness is implied The information is provided on an as is basis New Stage Accompany B V shall have neither liability nor responsibility to any person or entity with respect to any loss or damages in connection with or arising from the information contained in this manual New Stage Accompany B V reserves the right to alter specifications without prior notice A NEW WORLD OF SOUND SSA 100 USER MANUAL stage accompany Table of Contents Quick Introduction to the SSA 100 Introduction Connections Operation Recommendations Technical Specif
6. al to the cable gauge while it is inversely proportional to the number of SSA 100s supplied through the cable On this and the next page per mains voltage a table is shown with the maximum mains cable length in meters given the cable gauge in square millimeters and the number of SSA 100s supplied through the cable 110 120 V Cable Gauge mm 15 25 4 0 6 0 10 0 16 0 1 46 75 120 180 300 480 2 23 38 60 90 150 240 3 15 25 40 60 100 160 No 4 11 19 30 45 75 120 an 5 9 15 24 36 60 96 100s 6 8 13 20 30 50 80 7 6 11 17 26 43 69 8 6 9 15 23 38 60 9 5 8 13 20 33 53 10 5 8 12 18 30 48 Table 3 2 Maximum cable length as a function of the cable gauge and the number of SSA 100s supplied through the cable A NEW WORLD OF SOUND an o stage accompany SSA 100 USER MANUAL Cable Gauge mm 220 240 V 1 5 2 5 4 0 6 0 10 0 16 0 1 180 300 480 720 1200 1920 2 90 150 240 360 600 960 3 60 100 160 240 400 640 4 23 75 120 180 300 480 No of SSA 5 36 60 96 144 240 384 1008 6 30 56 80 120 200 320 9 7 26 43 69 103 171 274 s m 8 23 38 60 90 150 240 Q 9 20 33 53 80 133 213 2 10 18 30 48 72 120 192 E Table 3 3 Maximum cable length as a function of the cable gauge and the number of pa SSA 100s supplied through the cable 3 2 Booth Monitor Connection The SSA 100 can ea
7. and may damage the amplifier Always ensure that you use a correctly grounded power supply If more than one SSA 100 is to be used it is advisable to connect each one separately to the nearest mains supply in stead of connecting several SSA 100s using an adapter block see figure 3 1 E SNOILOANNOO SSA 100 Mains Supply SSA 100 SSA 100 SSA 100 OK Mains Supply SSA 100 ea SSA 100 Figure 3 1 SSA 100 connections to the mains supply A NEW WORLD OF SOUND e stage accompany pag SSA 100 USER MANUAL This will prevent unnecessary power loss in the mains cables If circumstances do not allow this it is advisable to connect the adapter block directly to the power supply using a short cable and then connect the individual SSA 100s to it using longer leads Although this method is not ideal it does limit power loss as much as possible Ultimately it is possible to place the adapter block near the SSA 100s but if a great deal of power is required from the unit the final current provided is far from optimum loss of current leads to unrecoverable loss of output power and therefore sound pressure Warning Always disconnect the SSA 100 from the power supply before operating on the fuse holders Replace a blown fuse only w
8. cuit with plug in modules extra functions can be added to the amplifier like cross over high low or band pass filtering equalisation and loudspeaker protection Special filter and protection boards are available for all Stage Accompany loud speaker systems The installation of an EFN module needs to be done by an authorized Stage Accompany service center Soft Start The soft start circuit is active when the SSA 100 is switched on The mains inrush current which normally is in excess of 100 A is limited to a safe value However take care not to switch on too many amplifiers at the same time or you risk that the main fuses of your distribution may trip Temperature DC HF and Short Circuit Protection The amplifier and the loudspeakers are protected against all possible damages 2 2 g NOLLONCOYLNI A NEW WORLD OF SOUND SSA 100 USER MANUAL e stage accompany 3 Connections Only three connections need to be made mains power audio input signals or booth monitor connection and loudspeaker leads Do not make any connections to the amplifier or to any preceding equipment with the amplifier switched on 3 1 Mains Power Connection The SSA 100 is internally selectable for 110 120 220 240V 50 60Hz mains voltage The exact voltage is stated at the rear of the amplifier Switching between mains voltages has to be done by an authorised Stage Accompany service centre Connecting to the wrong voltage is dangerous
9. el of more than 40 dB under the level that would cause maximum power 5 dBu is detected at the input connectors The signal present LEDs work independently of the settings of the input gain controls A NEW WORLD OF SOUND e stage accompany uN SSA 100 USER MANUAL e CLIP this LEDs will light when the output levels of the amplifier have reached their limits The indication is correct for every connected impedance When the clip LEDs flash frequently distortion is to be expected e PROTECT when these LEDs light one of the following errors has occurred 1 Thermal overload the output devices of this channel have reached a temperature of 90 degrees centigrade and the input of that channel is muted Both channels work in dependently so themal overload of one channel does not affect the other channel In case of a continued overload it is possible that the power supply runs hot Also in that case the amplifier s inputs are muted When the internal temperatures have dropped 5 degrees the amplifier is unmuted 2 DC on output this indicates that a sufficient amount of DC or subsonic energy is de tected at the output of the amplifier and that the output connector is decoupled from the amplifier This also occurs when the amplifier is switched on and the electronic cir cuits need time to stabilise Approximately two seconds after you turn on the SSA 100 these LEDs should turn off 3 HF on input this indicates that
10. eps working The SSA 100 has a number of features including e High efficiency class G operation e Variable speed DC fan e DDC Dynamic Damping Control e EFN circuit Extended Function Network e Soft start to reduce power on inrush current e Temperature DC HF and short circuit protection Class G operation The power supply of the SSA 100 amplifier produces 2 different supply levels Each channel actually consists of two power amplifiers One produces the output signal the other one selects the power supply voltage This way the SSA 100 uses the low level supply at low output power and the high level supply at high output power which reduces internal dissipation significantly A NEW WORLD OF SOUND e stage accompany pag SSA 100 USER MANUAL DC Fan The built in DC fan has a continuous variable speed Its control circuit monitors the temperature of the output devices and the temperature of the power supply The speed of the fan is calculated out of this information This system ensures that the fan always runs at optimum speed and thus produces less noise DDC DDC Dynamic Damping Control is a special way of measuring the cone movement of a loudspeaker The voltage induced in the voice coil is sensed and fed back to the amplifier s feedback circuit Hence a virtually infinite damping is achieved which results in an exceptionally tight sound reproduction and less distortion EFN Through the internal EFN cir
11. figure 3 2 SPEAKON NL4FC Y N Figure 3 2 SSA 100 4 terminal loudspeaker connection The signal and DDC Dynamic Damping Control terminals are linked together at the loudspeaker terminal The signal and DDC terminals are linked at the loudspeaker terminal A maximum damping is obtained with these connections If your speaker system is not prepared for a four terminal connection link the DDC and the signal leads at the input of the enclosure see figure 3 3 SPEAKON NL4FC Figure 3 3 SSA 100 2 terminal loudspeaker connection A NEW WORLD OF SOUND E SNOILOANNOO stage accompany pag SSA 100 USER MANUAL If you don t want to use the DDC feature at all the DDC and the signal leads should be linked at the amplifier output in the speakon connector see figure 3 4 The DDC terminals can also be left unconnected but then the performance will be less SPEAKON NL4FC Figure 3 4 SSA 100 loudspeaker connection without DDC Warning Never short circuit the DDC terminals and never connect the signal output terminal to the DDC terminal or vice versa see figure 3 5 Since you are disabling the amplifier s feedback network signal gain will be almost infinite The smallest input signal will result in full power output with the possibility of square waves damaging your louds
12. high frequencies are detected on the inputs In this case check you input cables It is also possible that the signal from any preceding ap paratus contains oscillations E NOILVHJ3dO When the lt PROTECT gt LEDs light during normal use and the amplifier is not hot check the following things Disconnect the input signal connectors When the LED s switch es off High frequencies where probably present on the inputs When this does not solve the problem you may try disconnecting the speaker system When the LED s switch es off DDC was probably not properly connected When neither of this solves the problem The amplifier is probably damaged and should be repaired by an authorised Stage Accompany service centre A NEW WORLD OF SOUND e stage accompany SSA 100 USER MANUAL 5 Recommendations for Optimum Use e Ensure that the quality of the mains supply is good enough and that it can supply the required peak currents In addition good earthing is necessary to prevent noise hum and safety problems If hum does occur it may be solved by using the ground lift switch on the back of the amplifier e Be sure that the SSA 100 is built into a space with sufficient circulation of fresh air A temperature that is constantly too high leads to switching on and off of the thermal pro tection and considerably reducing the lifetime of the amplifier e When built into a flightcase ensure yourself that there are sufficient possibilitie
13. ications Warranty Overview A NEW WORLD OF SOUND pa SSA 100 USER MANUAL stage accompany Table Of Contents 1 Quick Introduction to the SSA 100 0 0 e eee ee 1 1 2 INTFOGUCTION uv ira ee eters ee be Sed i wedi 2 1 3 Connection of the SSA 100 0 cee es 3 1 3 1 Mains Power Connection 000 cee eee eee eee 3 1 3 2 Booth Monitor Connection oo o 3 4 3 3 Audio Connections 0 000 eee eee eee es 3 4 3 4 Loudspeaker Connections 00 0c eee eee 3 5 4 Operatlon 2 205224 ras ce betes naai cabs eee A Rew ene 4 1 4 1 INPULATIGNUGIOIS aioe sche rar does sy are dls aw a din 4 1 4 2 Ground Lift Switch eie e sosea 0 0 0 0 kE Ea ELER eae 4 2 4 3 NaNO E 2 0 2 La ata ara da a e de N E E E EES 4 2 5 Recommendations for Optimum Use 2000s eee eee eee 5 1 6 Technical Specifications 0 00 eee eee eee 6 1 7 Warranty arera ra eed hed caren etd are aa ean 7 1 8 OVER Adee do Ata eaten hee eda Soe 8 1 g SLNALNOO AO 418V A NEW WORLD OF SOUND SSA 100 USER MANUAL stage accompany 1 Quick Introduction to the SSA 100 Thank you for choosing a Stage Accompany Power Amplifier Making this choice has guaran teed you many years of troublefree amplification If you have to start using the SSA 100 straight away and do not have time to read the complete manual make sure that you at least read the following Ensure that
14. ith a new one of the same type and value Current Table Below the current consumption of the SSA 100 is tabulated for two selectable mains voltages The power consumption shown applies to 1 8 of maximum output power pink noise in 2 Q which is representative for typical music program with occasional clipping If your soeaker system has an impedance of 4 or 8 Q you may multiply the currents by 0 5 or 0 25 g SNOILOANNOO Mains Voltage V No of SSA 100s 110 120 220 240 Current Consumption A 1 6 3 2 12 6 3 18 9 4 24 12 5 30 15 6 36 18 7 42 21 8 48 24 9 54 27 Table 3 1 Current consumption as a function of the mains voltage at 1 8 of maximum output power with pink noise in 2 Q The mains voltage may NOT deviate more than 20 to 10 of the nominal value The proportional mains voltage cable loss may not exceed 10 The following formula may be used to calculate the maximum mains cable length in meters for 220 240 V models A NEW WORLD OF SOUND yr SSA 100 USER MANUAL stage accompany G 120 Maximum Length ML N The two input variables are N number of SSA 100s supplied through the cable G cable gauge in square millimeters For 110 120 V models the following formula applies G 30 N Maximum Length ML E SNOILOANNOO This means that the cable length is proportion
15. ity in every situation GOOD LUCK A NEW WORLD OF SOUND an e stage accompany 6 Technical Specifications Input sensitivity Maximum Input Level Input Impedance Common Mode Rejection Ratio CMRR Frequency Range Gain Channel Separation Total Harmonic Distortion THD Intermodulation Distortion SMPTE IMD Signal to Noise Ratio Slew Rate Damping with DDC Output power 1 THD Continuous Power Delivered Peak Power Delivered Mains Supply Voltage SSA 100 USER MANUAL 1 0 Vrms 2 5 dBu full continuous power into 4 Q 20 dBu 20 kQ balanced gt 55 dB O 1 kHz 15 Hz 20 kHz 0 3 dB lt 10 Hz 70 kHz 3 dB 32 dB 40x 75 dB O 1 kHz 50 W into 8 Q 55 dB 20 kHz 50 W into 8 Q lt 0 3 20 Hz 20 kHz more than 2 Q load at all powers 1 dB below clipping lt 0 01 1 kHz 50 W into 8 Q lt 0 1 20 kHz 50 W into 8 Q lt 0 07 200 Hz 10 kHz lt 0 2 O 10 kHz 20 kHz f1 70 Hz 4 1 50 W into 8 Q f SNOLLVIIID3IAS gt 112 dB A weighted gt 40 V us 80 gt 10 000 O 1 kHz 10 V 8 2 x 290 W RMS into 8 Q 2 x 425 W RMS into 4 Q 2 x 525 W RMS into 2 Q 2 x 340 W into 8 Q 2 Xx 535 W into 4 Q 2 x 700 W into 2 Q internally switchable 110 120 220 240 VAC A NEW WORLD OF SOUND e stage accompany pag SSA 100 USER MANUAL Power consumption typical Idle 50 VA 1 8 Power pink noise 2 Q 700 VA
16. nclosure Splitting the leads at the amplifier output terminals solves these problems see figure 3 8 The DDC system corrects the performance loss due to connectors loudspeaker cables and so on However it cannot prevent loss of power So only use cables of minimal 2 x 1 5 mm or more for the loudspeaker leads and 2 x 0 75 mm for the DDC leads A NEW WORLD OF SOUND yr SSA 100 USER MANUAL stage accompany An indication of the proportional cable power loss percentage of the amplifiers total output power can be calculated using the following formula 100 29 4 G R L Proportional Power Loss 1 where the variables represent L cable length in meters G cable gauge in square millimeters R DC resistance of the loudspeaker s in ohms This formula is based on the DC resistance in stead of the complex impedance of the loudspeaker s However the approximation can be used to get a good impression of the loudspeaker cable power loss Per loudspeaker impedance a table is shown in tables 3 9 to 3 12 with the proportional power loss given the loudspeaker cable gauge in square millimeters and the cable length in meters E SNOILOANNOO Cable Gauge mm 160 1 5 25 3 0 4 0 6 0 10 0 16 0 20 2 8 1 7 1 4 1 1 0 7 0 4 0 3 Cable Length 30 4 1 2 5 2 1 1 6 1 1 0 6 0 4 m 40 5 4 3 3 2 8 2 1 1 4 0 8 0 5 50 6 6 4 1 3 4 2 6 1 7 1 1 0 7 100 12 4 7 8 6
17. peakers E SNOILOANNOO Therefore check your cables regularly We also advice you to use special Stage Accompany 4 wire loudspeaker cable 2 x 3 0 mm and 2 x 0 75 mm SPEAKON NL4FC Er ES Mg ne gt W Figure 3 5 Dangerous SSA 100 output connection Figure 3 6 Dangerous SSA 100 output connection a SPEAKON NL4FC A NEW WORLD OF SOUND stage accompany pag SSA 100 USER MANUAL When more speakers are going to be connected to one amplifier split the output and DDC leads as soon as possible behind the output terminals of the SSA 100 see figure 3 7 on this and figure 3 8 on the next page SPEAKON NL4FC E SNOILOANNOO Figure 3 7 Try to avoid this way of connecting several enclosures to the SSA 100 A NEW WORLD OF SOUND pag SSA 100 USER MANUAL stage accompany SPEAKON NL4FC E SNOILOANNOO Figure 3 8 Correct way of connecting several enclosures to the SSA 100 The amplifier can cope with any load of 2 Q or higher This means that you may connect a maximum of two 4 Q four 8 Q or eight 16 Q loudspeakers per channel in parallel Linking the loudspeakers from one enclosure to another has two major disadvantages 1 The loudspeaker cable from the amplifier to the first enclosure conducts the current for all enclosures which means extra losses 2 The DDC only works for the first e
18. s for the heated air to leave the flightcase When more SSA 100s are built into one flightcase install an extra fan in the case Air flow of the SSA 100 goes from front to back e Do not make connections to the amplifier or to any preceding equipment with the am plifier switched on e A faulty fuse must ALWAYS be replaced by a new one of the same type and value A different fuse can cause permanent damage to the amplifier All internal fuses are of an automatic type so they do not need to be replaced Always disconnect the SSA 100 from the power supply before operating on the fuse holder When a replaced fuse immediately blows again the amplifier is defect and should be repaired by an author ised Stage Accompany service centre Do not try to replace the fuse again because you may risk further damage to the amplifier p SNOILVGNAWWOOAY e Repairs to the SSA 100 should only be carried out by an authorised Stage Accompany service centre Never dismantle the SSA 100 yourself you may risk damaging vital components moreover the guarantee becomes irrevocably invalidated e Read this manual carefully Try out the various functions described in this manual In this way you will soon become familiar with the many possibilities that the SSA 100 of fers It is just as important that your colleagues who will use the SSA 100 also read the manual With a good knowledge of the working of the SSA 100 it is possible to fully utilize its superior sound qual
19. sily be connected to a cinema booth monitor through the HD15 Data Port connector All signals for monitoring the amplifier s inputs and outputs as well as input signals and various control signals are present on this connector Only two more connections have to be made to the amplifier power and loudspeaker cables 3 3 Audio Connections The XLR input connectors of the SSA 100 are wired as follows Pin1 ground GO SN Pin2 normal phase signal or hot 90 f NN O Jj R Pin3 inverted phase signal or cold QEUTRIK Always use high quality XLR connectors and shielded signal cables The input stages are electronically balanced To make optimum use of the balanced input stages even in unbalanced situations use balanced signal cables and connect pin 3 to pin 1 at the output of the preceding equipment If this is not possible connect pin 3 to pin 1 at the input of the SSA 100 A NEW WORLD OF SOUND an stage accompany SSA 100 USER MANUAL 3 4 Loudspeaker Connections Due to the DDC feature the SSA 100 has 4 output terminals per channel instead of 2 The loudspeaker output connector is wired as follows 1 I N l Pin 1 hot or Signal thee AS Pin 1 cold or Signal MSN KE Se Pin 2 DDC hot or DDC Geren A Pin 2 DDC cold or DDC E For optimum performance the amplifier to loudspeaker connections should be made as shown in
20. th 3 10 E SNOILOANNOO A NEW WORLD OF SOUND e stage accompany uN i SSA 100 USER MANUAL 4 Operation After connection to the correct mains voltage the SSA 100 can be switched on using the lt POWER ON OFF gt switch The various functions of the system will now be described one after one 4 1 Input Gain Controls The input gain controls consist of two conductive plastic potentiometers situated on the rear side of the amplifier which are calibrated in dB The controls are used to mute the input signal or to adjust the sensitivity of the SSA 100 to other amplifiers The relative sensitivity to other Stage Accompany amplifiers is SSA 200 0 dB 3 ES 10 5 dB m ES 20 2 dB gt ES 40 1 dB 3 SA 800 5 dB gt SA 1600 2 dB PPA 1200 2dB E Attenuation in the complete counter clockwise position oo is gt 90 dB 4 2 Ground Lift Switch If hum is audible after switching on the SSA 100 the cause may be incorrect earthing of your sound system The lt GROUND LIFT gt switch can be used to lift the connection between the system earth and the mains earth This action alone is often sufficient to eliminate the undesired noise caused by a bad grounding system or ground loops 4 3 Indicators Each channel of the amplifier is equipped with the following indicators e POWER these LEDs will light when the amplifier is switched on e SIGNAL these LEDs will light when an input lev
21. w QOVOOQO QQ QOOOVO CHANNEL 1 CHANNEL 2 PROTECT STAGE ACCOMPANY Made in The Netherl Protect Clip Signal and Power LEDs Channel 1 Protect Clip Signal and Power LEDs Channel 2 Power switch Ground lift switch Fuse AC mains cable Output Channel 2 Output Channel 1 Input Channel 2 Input Channel 1 Gain control Channel 1 Gain control Channel 2 Data port connector Zemas SSA 100 A NEW WORLD OF SOUND g MAIAYSAO
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