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1. SAFETY PRECAUTIONS

3

 Be sure to read the instructions in this section carefully before use.
 Make sure  to observe  the instructions in this manual as the conventions of safety symbols and messages
 regarded as very important precautions are included.
 We also recommend you keep this instruction manual handy for future reference.

Safety Symbol and Message Conventions

Safety  symbols and messages  described  below are used in this manual  to prevent  bodily injury and  property 
damage  which  could  result  from  mishandling.  Before  operating  your  product,  read  this  manual  first  and
understand the safety symbols and messages so you are thoroughly aware of the potential safety 

Indicates a potentially hazardous situation which, if mishandled, could
result in death or serious personal injury.

Indicates a potentially hazardous situation which, if mishandled, could
result in moderate or minor personal injury, and/or property damage.

When Installing the Unit

   Do not  expose  the unit   to rain or an  environment
    where it may be splashed by water or  other liquids, 
   as doing so  may result in fire or electric shock.

   Use the unit only with  the voltage  specified  on the
   unit.  Using  a  voltage  higher  than  that  which  is
   specified may result in fire or  electric shock.

   Do not cut, kink, otherwise damage   nor modify the
   power  supply  cord.  In  addition,  avoid  using  the
   power cord in close proximity to heaters,  and never
   place heavy objects -- including the unit   itself -- on 
   the  power  cord,  as  doing so may result  in  fire or  
   electric shock.

 Be sure  to replace  the unit's   terminal  cover  after
 connection  completion.  Because  high  voltage   is
 applied to the speaker terminals, never touch these 
 terminals to avoid electric shock.

 Be  sure  to  ground  to  the  safety   ground  (earth)
 terminal to avoid electric shock. Never  ground to a 
 gas pipe as a catastrophic disaster may result.

 Avoid  installing  or  mounting  the  unit  in  unstable
 locations, such  as  on a rickety   table   or  a slanted

surface.  Doing  so  may  result  in  the  unit   falling

 down,   causing   personal   injury  and/or  property 
 damage.

When the Unit is in Use

   Should  the  following  irregularity  be  found  during 
   use, immediately switch  off  the  power, disconnect
   the  power  supply   plug  from  the  AC  outlet  and 
   contact your nearest sound choice dealer. Make no 
   further attempt  to operate the unit in this   condition 
   as  this may cause fire or electric  shock.
     If  you  detect  smoke  or  a strange  smell coming
     from the unit.
     If water or any metallic object gets into the unit
     If the unit falls, or the unit case breaks
     If the power supply cord is damaged (exposure  of
     the core, disconnection, etc.)
     If it is malfunctioning (no tone sounds.)

   To prevent  a fire or electric  shock, never open  nor
   remove  the  unit  case  as  there  are  high  voltage 
   components  inside  the  unit.  Refer all servicing to
   your nearest 

 dealer.

sound choice

 Do  not  place  cups,  bowls,  or other containers   of
 liquid  or  metallic  objects on top of the unit. If  they 
 accidentally spill  into the unit, this may cause a fire 
 or electric shock.

  Do   not   insert    nor   drop    metallic    objects   or 
  flammable  materials  in  the   ventilation slots  of the
  unit's  cover,  as  this  may  result   in  fire  or electric
  shock.

Summary of Contents for 4120A

Page 1: ...optimum resultsfrom this unit We also recommend that you keep this manual handyfor future reference 4 CHANNEL AMPLIFIER 4120A POWER TEMP ON OFF 5 0 1 2 3 4 6 7 8 9 10 CH 1 5 0 1 2 3 4 6 7 8 9 10 CH 2 5 0 1 2 3 4 6 7 8 9 10 CH 3 5 0 1 2 3 4 6 7 8 9 10 CH 4 PROTECT SIGNAL CLIP 4120A 4 CHANNEL AMPLIFIER ...

Page 2: ...2 GENERAL DESCRIPTION 5 3 FEATURES 5 4 NOMENCLATURE AND FUNCTIONS 4 1 Front Panel 6 4 2 Rear Panel 7 5 CONNECTIONS 5 1 Speaker Connections 5 2 Input Connections 6 APPLICATIONS 7 BLOCK DIAGRAM 10 8 SPECIFICATIONS 11 9 DIMENSIONAL DIAGRAM 12 8 8 9 ...

Page 3: ...g so may result in fire or electric shock Be sure to replace the unit s terminal cover after connection completion Because high voltage is applied to the speaker terminals never touch these terminals to avoid electric shock Be sure to ground to the safety ground earth terminal to avoid electric shock Never ground to a gas pipe as a catastrophic disaster may result Avoid installing or mounting the ...

Page 4: ...When the Unit is in Use Do not place heavy objects on the unit as this may cause it to fall or break which may result in personal injury and or property damage In addition the object itself may fall off and cause injury and or damage Make sure that the volume control is set to minimum position before power is switched on Loud noise produced at high volume when power is switched on can impair heari...

Page 5: ... 120W 100V 70V line transformer isolated speaker outputs low impedance 4 ohms speaker outputs Four independent amps in a singale chassis Four line level inputs Commercial grade torroidal transformers produce high performance audio on a wide range off frequencies Intelligent limiter can reduce excess signal Reliable protection against overload short circuit and power fluctuation for optimum reliabi...

Page 6: ...t to protection the amplifier from damage This indicator will be extinguished when amplifier is under normal working conditions 6 POWER Power indicator LED 7 TEMP The protection indicator will be light on when the inside temperature is over 90 the output will be cut to protect the amplifier from damage It will resume to work after cooling down 4 NOMENCLATURE AND FUNCTIONS 4 1 FRONT PANEL 1 2 5 4 3...

Page 7: ...ork properly you must wrap the hole can not have any object covered to avoid overheating protection 4 2 REAR PANEL 7 8 9 10 11 1 2 3 1 2 3 1 2 3 1 2 3 CH 1 OUT CH 2 OUT CH 3 OUT CH 4 OUT CH 1 IN CH 2 IN CH 3 IN CH 4 IN COM 100V 4 70V COM 100V 4 70V COM 100V 4 70V COM 100V 4 70V RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR AVIS RISK OF ELECTRIC SHOCK DO NOT OPEN XLR BAL INPUT 1 GND 2 HOT 3 COLD 240V 50H...

Page 8: ...5 CONNECTIONS 100V LINE 70V 100V 70V LINE 5 1 SPEAKER CONNECTIONS 4 COM 4 70V 4 8 70V 100V COM 4 70V 100V COM 4 5 2 XLR CONNECTIONS 4120A 41 4120A 83 ...

Page 9: ...R L L CD Player AUDIO OUT R R L L CD Player AUDIO OUT R R L L CD Player CH1 IN Ch2 IN Ch3 IN Ch4 IN Multi channel Mixer Pre amplifier 4 Channel power Amplifier 1 2 3 1 2 3 1 2 3 1 2 3 CH 1 OUT CH 2 OUT CH 3 OUT CH 4 OUT CH 1 IN CH 2 IN CH 3 IN CH 4 IN COM 100V 4 70V COM 100V 4 70V COM 100V 4 70V COM 100V 4 70V RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR AVIS RISK OF ELECTRIC SHOCK DO NOT OPEN XLR BAL ...

Page 10: ...S TO TO EB EB PA PA 100V 70V 4 COM CH1 LINK CH1 LINK CH1 INPUTS CH1 INPUTS TO TO POWER POWER Z Z 240V 50Hz PT EB EB PA PA CH1 LINK CH1 LINK CH1 INPUTS CH1 INPUTS TO TO EB EB PA PA CH2 LINK CH2 LINK CH2 INPUTS CH2 INPUTS TO TO 100V 70V 4 COM 100V 70V 4 COM 100V 70V 4 COM ...

Page 11: ...D COOL METHOD INDICATORS 4 16 70V 100V 775mV 0dB 50Hz 16KHz d istortion 1 5dB 15V microsecond 1 Copulsive wind cool form Power Signal Protection Peaking Power on Overload and Protection POWER REQUIREMENTS 240V 50Hz 4120A 4X120W DIMENSION mm NET WEIGHT 484X448X88 POWER CONSUMPTION 22Kg 720W OUTPUTS NOISE 3mV IMPEDANCE 200 1 ...

Page 12: ...ER 1 2 3 1 2 3 1 2 3 1 2 3 CH 1 OUT CH 2 OUT CH 3 OUT CH 4 OUT CH 1 IN CH 2 IN CH 3 IN CH 4 IN COM 100V 4 70V COM 100V 4 70V COM 100V 4 70V COM 100V 4 70V RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR AVIS RISK OF ELECTRIC SHOCK DO NOT OPEN XLR BAL INPUT 1 GND 2 HOT 3 COLD 240V 50Hz 720W T8AL 250V N17795 POWER TEMP ON OFF 5 0 1 2 3 4 6 7 8 9 10 CH 1 5 0 1 2 3 4 6 7 8 9 10 CH 2 5 0 1 2 3 4 6 7 8 9 10 CH ...

Page 13: ...PUBLIC ADDRESS SYSTEM VersionV0 1 ...

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