speaker's buzzing noise

[sevo]

Hello,
When I connect my speakers (both sides and center channel) to their respective amplifiers, I hear a humming/buzzing noise that will only go away if I turn off the amplifiers and not the sound processor. Do you know what the problem might be? Thanks

[PewterTA]

You've got a ground loop issue... disconnect the cable line into your cable box and see if it goes away. If it does then you need a ground loop isolator.

[stevek]

i had a similar problem and it turned out to be a bad board in my processor.i only heard the buzzing when i hooked up the 7.1 analog inputs from an oppo to the processor.when i disconnected the analog jacks it went away.it also crossed over to the hdmi.when the board was changed it was gone.
dont know your set up but you never know.we thought at first it was ground loop issue because it usually is.
just a thought if its not ground loop.good luck

[audioqueso]

we thought at first it was ground loop issue because it usually is.

Exactly.

If you turn off your amplifier, of course it will go away because that is the source that is feeding power to your speakers.
Mostly like a grounding loop.
I would say to disconnect your sources, as Pewter suggested. If the buzz is gone, then it's one of your sources.

If the buzz is still there even after disconnecting your sources, then disconnect the processor from the amp. If the buzz is gone, then I would suggest to play around and try different outputs from your processor.

If the buzz is still there even after disconnecting your processor, then you're down to your amp. At this point, it can be a multiple of things.
Try different speaker cable. If it's an amp with more than 3 channels, try a different channel. If nothing still resolves it, try a different power cord or try moving it to a different location in the house (the point is to move it to a different breaker).

I had a problem with one one channel.
It ended being that only the right front BALANCED output was fault on my Marantz AV7005. Unbalanced RCA output was fine, as was every other balanced and unbalanced output. So I had to send the unit back to Marantz to repair it. Good luck. Let us know if you still need any more tips on troubleshooting your buzzing problem.

[Stilgar]

Have the same problem with rotel RB 1080... Left channel generate humming/buzzing noise, right channel has the same noise but much quieter. This is appear when amp is switch to unbalanced rca inputs, when inputs switch to balanced everything is ok.