background image

Powers in watts r.m.s per channel using 1 kHz tone.  
The peak powers are short term maximum peak powers.  
All other power measurements are long term continuous tone.  
 
FREQUENCY RESPONSE: 3.5 Hz - 22 kHz  + Odb  - 3db  
 
INPUT SENSITIVITY:           OdBm   0.775v  
 
DAMPING FACTOR >           100 @ 100Hz  
 
DISTORTION:                       0.05% @ 1Khz  
 
INPUT IMPEDANCE:            35Kohms  
 
NOISE LEVEL:                      -95dBm  
 
CONTROLS FRONT:            Power On / Off Green Neon rocker switch.                                            
                                              Channels 1, 2, 3, 4. rotary volume controls, & associated  
                                              channel clip indicators, bridge  mode indicators, fan run  
                                              indicator, 2 fault indicators.  
CONTROLS REAR :             2 Bridge mode switches, 2 mono / stereo mode switches. 
PROTECTION:                      Individual channel protection disconnects speakers  
                                              when 800mV, DC is present  on output. Fuses also  
                                              provide short circuit protection.  
THERMAL:                            Automatic shutdown @ 150 deg C ( Auto reset)  
COOLING:                            2  fans speed change switched on at 50 deg C.  
INPUTS:                                1  IEC Mains socket for A/C input 
                                              8  stereo input/link jacks balanced line, 2 per ch  
OUTPUTS:                            4  XLR male sockets 1 per channel 
MAINS FUSE:                       12.5A HRC 20mm.  
POWER FUSES:                  4 x 10A  20mm. (internal) 
SIZE:                                     483 X 90 X 290.  (19"  x 3.5" x 11+" ) 
WEIGHT:                              17Kg ( 38lbs. )  
MAINS SUPPLY:                  240/220v or 120/110v. A.C. 50/60 Hz  
                                             1.4KVA @ full power.  
 

 
 

6.  

FAULTS AND THEIR LIKELY CAUSES

 

 
Although the greatest care has been taken in the manufacture of the power amplifier, the 
possibility remains that faults could occur during use or difficulties could be experienced 
during initial installation. 
 
The cause, however, will rarely be found to be internal to the amplifier.  Below is a list of 
symptoms and possible causes.  Some of the suggested causes may appear obvious but 
they can be easily overlooked. 
 
Under no circumstances should you open the amplifier ; this is dangerous, will expose 
high voltages, and will invalidate all rights under the guarantee.. 
 

Summary of Contents for QPX1200

Page 1: ...DUAL CHANNEL AUDIO POWER AMPLIFIER OWNERS MANUAL Hz INTERNATIONAL LTD COMBE HOUSE STOKE ST MICHAEL BATH SOMERSET ENGLAND QPX1200 CE 96 ...

Page 2: ...cking 2 Siting the power amplifier 3 Connections 4 Fitting a mains plug OPERATION 1 POWERING UP 2 SELECTING MODE 3 PEAK INDICATOR 5 TRIP INDICATOR AMPLIFIER MAINTENANCE TECHNICAL DATA FAULTS AND THEIR LIKELY CAUSES 1 INSTALLATION ...

Page 3: ...r ventilation and the air is not recycling b Rack mounting Ears are provided for both front and rear support a choice of mounting position is given on the front brackets either proud level with the front panel or sunk by 20mm and flush with the front escutcheon c Care is required when installing these units in a rack It is advised to put the Rack on its back then place all the equipment being fitt...

Page 4: ... CABLES The inputs are electronically balanced for those who require this facility with the tip of the jack being hot and the ring cold or balanced line and the sleeve ground However they can be used unbalanced with standard mono jack plug A link jack input is provided on each input channel so that any of the four channels can be joined together or linked down to another power amplifier in the rac...

Page 5: ... down the volume controls during switch on as precaution against speaker damage Which can be caused by instant high level feedback from an open channel mixer mic or system instability On initial switch on the trip indicator will light this should go out after a few seconds when the amplifier supplies have stabilised It is not recommended to switch the amplifier on and off rapidly several times ove...

Page 6: ...ier enclosed in a sealed rack with no air vents If the trip light fails to extinguish after 30 seconds from cold switch on then there is an internal fault in the amplifier and the relevent speaker s have been disconnected to protect them Advice should be sought from your dealer AMPLIFIER MAINTENANCE The amplifier contains no use serviceable parts inside Maintenance should be mainly preventative ta...

Page 7: ...o reset COOLING 2 fans speed change switched on at 50 deg C INPUTS 1 IEC Mains socket for A C input 8 stereo input link jacks balanced line 2 per ch OUTPUTS 4 XLR male sockets 1 per channel MAINS FUSE 12 5A HRC 20mm POWER FUSES 4 x 10A 20mm internal SIZE 483 X 90 X 290 19 x 3 5 x 11 WEIGHT 17Kg 38lbs MAINS SUPPLY 240 220v or 120 110v A C 50 60 Hz 1 4KVA full power 6 FAULTS AND THEIR LIKELY CAUSES ...

Page 8: ...nsure free air flow into and out of the unit The amplifier will reset itself when cool Or the amplifier has developed an internal fault please consult your dealer As a general rule jack plugs and sockets are very reliable especially if they are regularly connected and disconnected In situations where they are subject to prolonged static use it is good practice to clean the plugs and to clean the s...

Page 9: ...at has been replaced shall become the property of the company and the right is reserved by the company to replace the equipment or repair it at the option of the company 8 This guarantee applies to equipment purchased and used within the E E C The importers of equipment in non E E C countries are responsible for the guarantee of this equipment Parts required under guarantee are free Shipping charg...

Reviews: