Left and Right Channel volume difference

I have some old 2.1 computer speakers that I have been using to listen to recorded meetings/podcasts etc.

The two seemingly 8-10W speakers draw power from the subwoofer. Two cables.

The back of the subwoofer has the left and right ...push-naked-cables-in sort of connectors. See image
Except...Mine has only 4. 2 for each channel.


The left channel works fine. But the right channel audio is low. So I adjust my output from PC to 64:36 ratio. (64 to the low right channel to give it a boost to equalize the volume)
And if I keep the volume on my pc below..say 30-35... eventually the left channel will just go quiet. or keep going in and out.
I don't touch the volume pot on the subwoofer much. I do volume control from pc.

I have changed the 3.5m aux cable that connects from PC 3.5mm to subwoofer 3.5mm input. Didn't help.

Can someone list some places I should be looking? And how to determine which part might be causing this?
I can open up the subwoofer, I can solder etc.

Thank you
 

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I presume You have already switched speakers to rule them out.

Could be many things:

Bad / dirty pot
Bad 3.5 Jack
Bad cable / connector inside
Cracked solder pads
Failed / burned parts.

Open the think and start wiggling cables / tapping boards to see if it comes to life.