Like the others, this seems like some sort of ground loop thing. Once you figure that out, then run Audyssey correctly, go back and fine tune the receivers settings and leave the sub settings alone.

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85