Buzz or Noise in Distribution Amp Output
I have a multi-zone audio distribution system. Each output is 25w/ch and can support 8 or 4 ohm loads. In some rooms, I hear a hum or buzz when the system is off. In some cases, briefly turning the zone on will alleviate the matter temporarily. Doing so often results in a small audible "pop" as if it were relieving pressure at the output. In some areas, this action does not change anything.
I do not have info on the type of amp used. Sources and amps are all on the same power circuit. In my mind, this eliminates a ground loop scenario and points to a cheap noisy amp.
At present, every zone is an 8ohm stereo pair.
Is there something that can be done to bleed off this noise at the amp? Possibly a small resistor across the speaker outputs? Any suggestions?
In that case induced/magnetically coupled Mains voltage will reach speakers, weak but audible in a silent room.
Turning amp ON places a virtual short across wires.
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