Help With Buzzing Sound

@acefactory  Thanks.  Pretty sure it's the amp itself.  Only three years old with light use.  Hoping for some insights as to the most likely internal issue.  A bit surprised by the lack of response?  Cheers. 

Try a cheater adapter on the power cable to eliminate a potential ground loop issue. 

@OP Buzzing has three principal causes - mains or signal grounding issues, electromagnetic interference, or component failure. If you have absolutely eliminated the first two then the first place to look is the power supply in the amp. Regrettably, if you are not a technician yourself, you probably have no option but to enlist the help of one. If the amp is out of warranty, any decent tech should be able to fault find it. Power amps are among the simpler components in hi fi. I know you say you have moved things around, but if you haven't done it, I would physically move the right hand amp and all of its cables over to the location of the left hand amp. EMI can be weird. It's a very long shot but worth checking. However, I still agree with your surmise that it's the amp that has a problem. But you never know.

@bigtwin ,

Seriously, ask ChatGPT.

It will give you a complete rundown of probable causes, and solutions to each cause. As you narrow it down, it will give you an increasingly in depth solution to your problem.

That AI business is really something.

I recently had a kitchen remodel using a lot of led lighting. I have a mini system in the kitchen that popped and periodically hummed when the lights were on. I plugged the amp into a cheapie surge protector and all was resolved. Maybe a line conditioner would help the humming mono block.