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?
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?
I suspect some speaker wires travel near Mains one, maybe even thrugh same or side by side conduit.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
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.
Simple turn-on Pop, don´t look any furtheroften results in a small audible "pop" as if it were relieving pressure at the output.
Cheap amps are not noisy if OFF.cheap noisy amp
Nothing to "bleed" but you can kep amp ON.Is there something that can be done to bleed off this noise at the amp? Possibly a small resistor across the speaker outputs?