Help With Buzzing Sound

First, of course, try to rule out any issues with the amp itself, but here's my similar story:

A few years ago I spent an inordinate amount of time chasing down a buzz from a single of my two monoblocks, and ultimately fixed (i.e., completely eliminated) it by moving my entire system over to power from a 2.4kv AC line transformer (Topaz).

Before that purchase (a few hundred dollars) I figured out the issue stemmed from a dimmer on the under-cabinet lights in the kitchen, but for whatever reason it only affected one channel. It was nevertheless 100% solved with the A/C transformer.

Good luck to you - I know first hand how frustrating that can be! 

@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.