I recently had my electrician in to put all of my Home Theater circuits on the same line in my cicuit breaker panel.
Hence since doing so my hum is gone. However I do have to plug my Infocus 7205 in a wall socket and not my Monster 3600 for reasons unknown I get a hum when I do this. Yet when it is plugged to the wall (7205) even when other pieces of equipment are in the 3600 I do not get the hum. Right now I have two Dvd players, and the 990 plugged to the 3600 line conditioner. The Fathom 113 and projector are in another 20 amp recptacle. The remaining laser disc and cd player are in the Monster 3500 on the other side of the room and again in another recptacle.