Hum from sub

Speaker Asylum

General speaker questions for audio and home theater.

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: 05/19/17

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Parts Connexion

Topic - Hum from sub - docw 14:16:44 05/19/17 (4)

RE: Hum from sub - airtime 07:34:23 05/20/17 (0)

RE: Hum from sub - bullethead 18:27:37 05/19/17 (2)

RE: Hum from sub - reuben 04:57:35 05/20/17 (1)

RE: Hum from sub - miner42 13:17:35 05/22/17 (0)

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