Subwoofer HUMMMMM


even when nothing is connected but the power cord
stringreen
The plate amp probably went bad. I had that happen to me.

I have seen ads on e-bay for repairs if yours is out of warranty.
@stringreen. I don't see any subs. listed in your virtual system.  A fine system indeed!!   What subs. do you have?
I have a 5.1 system in another room......Denon/Sony TV, with NHT speakers, there are 2 speakers in the ceiling of every room in the house for background music