I have a Denon AVR 2313, sub out through coax to a sub across the room.
The sub has started to produce a hum. No breaks in wires. I made a heavier duty power cord with heavy duty plug.
Switching power off and waiting a time or overnight will cure it, and then it comes back without warning, even when we are just watching TV.
Room has rheostat controlled recessed lighting. Usual stuff.
Where/how do I start to look for the source of hum?
Edits: 05/19/17This post is made possible by the generous support of people like you and our sponsors:
Topic - Hum from sub - docw 14:16:44 05/19/17 (4)