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953.402UK User Manual 

Specifications 
 

Power supply 

230Vac, 50Hz (IEC) 

Power consumption max. 

280W 

Fuse 

F5A, 250V 

Output power rms @ 4 Ohms 

2 x 200W 

Output power rms @ 8 Ohms 

2 x 100W 

Amplifier: construction 

Class D 

Frequency response 

20Hz - 20kHz ±0.5dB 

Microphone inputs 

2 x 6.3mm jack (mono) 

Line inputs 

Line 1: L+R (6.3mm jack/RCA), Line 2: L+R (RCA), Aux (3.5mm stereo) 

Input sensitivity: line 

0.775Vrms 

Input sensitivity: aux 

0.480Vrms 

Input impedance 

20k Ohms (balanced), 10k Ohms (unbalanced) 

Audio source 

USB/SD mp3 playback, FM tuner, BT receiver 

Input controls 

Aux, Media, Line1, Line2, Mic1, Mic2, Talkover 

Line output 

2 x RCA 

Speaker outputs 

4mm binding posts (2 channels) 

Antenna connection 

F type (FM tuner) 

Output controls 

Source select, Bass, Treble, Ch1, Ch2 

Dynamic range 

92dB 

THD +N 

<0.1% 

Protection 

Thermal, over-current, over-voltage, short-circuit 

Dimensions 

482 x 240 x 88mm 

Weight 

5.21kg 

 

Troubleshooting 

 

No power LED on control panel 

Ensure IEC lead is in good condition and connected properly  
Ensure POWER switch is on and check mains inlet fuse 

Power light and output LEDs lighting 
but no output 

Check speaker output terminals are connected correctly 
Check speakers are working (test on another amp if available) 
Check memory device is connected properly (remove and re-insert) 
Check file types 

 standard mp3 digital audio files required 

Check memory device works on a PC or Mac for standard playback 

Bluetooth cannot connect 

Ensure that Bluetooth is enabled on sending device 
Ensure that the sending device is within Bluetooth range (5-10m) 
Check 

that the device is connecting to “

A series

 

No audio from Bluetooth device 

Ensure that volume controls are not turned down on sending device 
Check volume and Play/Pause buttons on media player 

Output too loud or distorted 

Reduce MIC, LINE IN, USB/SD and/or MASTER level 
Ensure Hi-Z line level input(s) not connected to a Mic input 

Output too quiet or inaudible 

Increase MIC, LINE IN, USB/SD and/or MASTER level 
Check for quiet recording of media files on USB  
Check VOX override is not unintentionally suppressing audio playback 

Feedback from microphone 

Face microphone away from speakers and monitors and reduce level 

Amplifier overheating 

Ensure cooling vents are clear from debris and dust 
Ensure that the load impedance on any output channel is no 

less than 4Ω

 

 

 

 

 

 

Disposal:

 

The “Crossed Wheelie Bin” symbol on the product means that the product is classed as Electrical 

or Electronic equipment and should not be disposed with other household or commercial waste at the end 
of its useful life. The goods must be disposed of according to your local council guidelines. 

 

Errors and omissions excepted. 

 

Copyright© 2018. AVSL Group Ltd. 

Summary of Contents for A2

Page 1: ...2 Rackmount Stereo Amplifier with Media Player Item ref 953 402UK User Manual Version 1 0 Caution Please read this manual carefully before operating Damage caused by misuse is not covered by the warranty ...

Page 2: ...r moisture Do not spill liquids on the housing 13 Please pay attention to warning symbols during transit and placement 14 Terminals marked with the symbol are HAZARDOUS LIVE and should only be connected by qualified personnel 15 Ensure that the apparatus is connected to a mains socket with a protective EARTH connection 16 Ensure correct operation of the mains switch Warning To prevent the risk of ...

Page 3: ...t 6 3mm jack 7 Line 1 input volume control 18 Mic 1 volume control 8 Line 2 input volume control 19 Mic 2 volume control 9 Stereo input selector 20 Talkover on off button 10 Bass EQ control 21 Output Signal Clip indicators 11 Treble EQ control 22 Ventilation grille do not obstruct airflow 27 Line output 23 FM antenna connection F type 28 Channel 1 speaker output 4mm binding posts 24 Line 2 input L...

Page 4: ...ernal media player Connect wired microphone s to the Mic 1 and or Mic 2 jack inputs 6 3mm on the front panel 16 17 The volume level of these is controlled by the Mic 1 and Mic 2 volume controls 18 19 A smart phone tablet or mp3 player can be connected to the Aux jack 3 5mm on the front panel 4 The volume level of this stereo input is controlled by the Aux volume control 5 To hear this input throug...

Page 5: ...a short flash of this LED may be indicating distortion or clipping of the output signal and the output channel volume control should be turned down Any microphones connected should not be able to hear the speakers which can cause feedback squealing or howling and should not be pointed towards the speakers If this still happens turn down the volume for that microphone and adjust Bass and or Treble ...

Page 6: ...e paused and resumed by pressing Pressing REP sets the repeat mode random single track folder all tracks Pressing EQ sets the preset bass pop rock jazz classical normal FM Tuner The FM tuner function operates in the same way as a standard FM radio and benefits from the connection of an FM antenna to the rear panel F type connector Press the media player MODE button until the display shows a freque...

Page 7: ...ode is selected connection should resume when Bluetooth mode is re selected If Bluetooth is disabled on the sending device or paired to a different receiver it will be necessary to re connect the sending device to the A2 from step 2 above to re establish a Bluetooth link Media player remote control In addition to front panel controls the media player can be operated via the supplied I R remote han...

Page 8: ...ed properly remove and re insert Check file types standard mp3 digital audio files required Check memory device works on a PC or Mac for standard playback Bluetooth cannot connect Ensure that Bluetooth is enabled on sending device Ensure that the sending device is within Bluetooth range 5 10m Check that the device is connecting to A series No audio from Bluetooth device Ensure that volume controls...

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