A&R A60 left channel less loud

[Geoffreybombom]

How do I test if my amp is outputting less on left channel than right, as I suspect. Thank you.

 

[colasblue]

Play a test tone and measure the outputs with a DVM or scope.

 

[a.palfreyman]

Or if you don't have the above, a pure mono recording should be bang in the middle. Check with headphones too.

 

[Geoffreybombom]

The amp seems fine with headphones, I have a mono cd will try that next, what is a DVM? Thank you.

 

[a.palfreyman]

Digital volt meter.

 

[Geoffreybombom]

Ok, I have a really good multimeter, will that do? I checked the bias, left read 7.5 right 7.9. I also checked the dc at the speaker posts left was 5mv right was 8.8mv. Thank you.

 

[cobbers]

If it's fine with headphones then switch the speakers L to R - check the speakers.

 

[Geoffreybombom]

Thank you cobblers,and everyone .I have switched left to right and confirmed left channel weaker/quieter, I was hoping to be able to component test with my comprensive multimeter.

 

[a.palfreyman]

What kit is it?

 

[Geoffreybombom]

A&R A60 amplifier.

 

[bugbear]

A&R A60 amplifier.

I think he meant the meter.

 

[Geoffreybombom]

Oh, it’s me being dopey again, it’s an Amazon own brand top end multimeter, very comprehensive. Thanks for putting me right.

 

[cobbers]

Room acoustics?

 

[Geoffreybombom]

No, it’s a recent thing, anybody which components I could check that may affect left-right diffences?

 

[Puggie]

Have you swapped speakers left to right, easy test?

Do you have a way of playing a constant tone into the amp (from a phone app or similar) then measure the AC voltage on the speaker terminals with your meter?

 

[Geoffreybombom]

I can play a test tone from my laptop, where do I measure the AC voltage?

 

[Puggie]

Just on the speaker terminals at the back of the amp. Should have the same ac voltage, if one is quieter you should see less volts. Make sure it’s AC and unless your meter is ‘true rms’ then use 50hz sine wave. Try with and without speakers connected, a dodgy crossover component could drag one side down.

 

[cobbers]

Poor speaker contacts? Perhaps bad solder joint in the amp.

 

[Geoffreybombom]

Thank you all, it’s not the speakers, I will try the AC test.

 

[a.palfreyman]

No, I meant the amp. Which outputs are you using, switched or direct? Did you try 'phones with mono source? If that was fine then unlikely to be the amp. Probably needs the switches cleaning, particularly those on the headphone circuit.
@Operajulian