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172.020UK/172.025UK  User Manual 

QA400/QA100 

QA SERIES POWER AMPLIFIER 

Item ref: 172.020UK/172.025UK 

User Manual 

 

 

 

 

 

19” Rackmount (2U) 

 

High power output 

 

Combo XLR/6.3mm jack and RCA inputs 

 

Speaker, 6.3mm jack and binding-post outputs 

 

Fan cooled 

 

Output circuit overload protection 

 

Mains powered via IEC connector 

 

Specification: 

 

QA400 

QA1000 

Output Max per channel @ 4Ω 

200W 

500W 

Output RMS per channel @ 4Ω 

100W 

250W 

Output Max per channel @ 8Ω 

140W 

340W 

Output RMS per channel @ 8Ω 

70W 

170W 

Dimensions 

88 x 482 x 

270mm 

88 x 482 x 

340mm 

Weight (unpacked) 

6.8kg 

9.1kg 

 

 
 
 

 
Thank you for purchasing this QTX Sound QA-series power amplifier.  
This product is intended to give long term, reliable service in normal usage.  

Please read these instructions before use to avoid incorrect operation and outline the functions and controls. 

 
 

Summary of Contents for QA400

Page 1: ...ctor Specification QA400 QA1000 Output Max per channel 4Ω 200W 500W Output RMS per channel 4Ω 100W 250W Output Max per channel 8Ω 140W 340W Output RMS per channel 8Ω 70W 170W Dimensions 88 x 482 x 270mm 88 x 482 x 340mm Weight unpacked 6 8kg 9 1kg Thank you for purchasing this QTX Sound QA series power amplifier This product is intended to give long term reliable service in normal usage Please rea...

Page 2: ...de 4 POWER SWITCH Switches mains power on off Rear panel 5 COOLING FAN Do not cover or restrict airflow 6 IEC MAINS INLET Check voltage and connect to mains with supplied lead 7 MAINS FUSE to replace fuse disconnect mains open with screwdriver 8 OUTPUT SECTION Connect speakers using speaker sockets jack or binding posts 9 INPUT SECTION Connect mixer or other audio source via combo XLR jack or RCA ...

Page 3: ...lower than 4Ω per channel When using 8Ω speakers connect the speakers in pairs to each other and then connect one of each pair to an amplifier channel output Connect the mixer or audio source to either the combo or RCA input sockets With channel A B levels down switch the power on Gradually increase channel levels and check for sound from speakers If there is no sound turn down channel levels swit...

Page 4: ...lifier DISTORTED OUTPUT Reduce the input signal level Ensure that the amplifier output level is within the maximum rating of the connected speakers and gradually increase the input signal ensuring that the signal is clean and free from distortion If protect mode is active refer to qualified service personnel This product is classed as Electrical or Electronic equipment and should not be disposed w...

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