I know there are many threads on buzzing, but I don't think I have encountered one that addresses the circumstances of my receiver. My Harman Kardon AVR 210 has developed a buzz. I moved last September and I can't be sure that the buzzing noise didn't start before my move, but it is very noticeable in my current home and has probably gotten slightly louder over the past few months. I have tested for ground loops and interference using suggestions I have found on other sites and here is what I have come up with.
If I unplug every input into my receiver and leave only the center channel and front channel speakers attached I still get the buzz. And the buzz is constant regardless of how loud the volume is and which input I choose (eventhough there is nothing connected to any of the inputs). I drove my receiver over to a friends house that is a couple miles away, plugged in the receiver and one speaker and I still heard the buzz. I think this rules out outside electrical and other interference that I might be encountering at my new home. Does this mean that my receiver is toast? One note: When I hooked up the speaker at my friends house I tried connecting the speaker to the front, rear, and center channels. The buzz was only noticeable on the front and center channels.
I am also not sure whether I would characterize this noise as a buzz or a humm (if it makes a difference), but there is clearly a constant noise.
Any suggestions are appreciated.
Thanks.
