Micheal,

Let me ask another round.

Turn on the Denon and amps. Turn off all other devices (tv, dvd, SAT, etc).

Do you still hear the buzz?

Set you denon to tv or dvd.

With your ear to a tweeter (NO devices are on), cycle through music, stereo, cinema, Neo, etc. Can you hear a very slight change in the volume of the buzz?

Doug