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Discussion in 'AV Receivers' started by Louisp, Jan 18, 2005.
What can cause a low level hum from speakers connected to an additional power amp?
Bad caps in the amp.
Ground loop anywhere in the system.
Power cord parallel to speaker wire/amp interconnect.
Ground loop would be the first thing to check for. Start with your CATV/SAT cable connection. If that's not it, then I'd disconnect and reconnect each source to see if any of them stop the humming.
If your ear has to be right next to the speaker too hear, its probably just the amps transformer.
Try plugging everything into one outlet. This eliminates differences in potential.
I had everything plugged into one outlet (via a Panamax 5100) and I still had ground loop hum from my CATV, so that is not always the case.
What about humming from the amp itself? I have one amp that hums.
Alan was talking about a ground loop that can be caused when the gear is plugged into circuits on opposite phases.
Wayne A. Pflughaupt
Can you make out the tune?
I have a pro audiostereo soundcraftsman amp that has a hum(actually ,more of a buzz) in one of the channels. A signal can get amplified through it,but it's distorted with the buzz that gets louder as you turn the amp up. I figured it may be bad caps too. The other channel is great.
Yeah, my main 3-channel amp buzzes/hums for the first 5 minutes of warmup. I'm figuring new caps are in its near future.
Pardon my ignorance but what are "caps"?