Another thing I've noticed is that when both 350's are turned on up front, I get a low humming sound from my center channel speakers. Is this a 60hz hum or whatever you guys call it?

It goes away or diminishes when I turn one of the 350's off, and totally goes away with they are both off.

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