Hi Juggernaut,

Try connecting the AC cord for the EP500 to a different circuit in your room than the one supplying the other components. Read my step-by-step instructions to eliminating ground loops here:
http://www.axiomaudio.com/tips_eliminate_hum.html

If you have a cable-TV set-top box (or a satellite TV tuner box) connected in any way to your NAD gear, that's almost always the likely source of the ground loop. Disconnect the video feed to see if the hum goes away.

Try unscrewing the ground-lift screw on the rear panel of the EP500.


Alan Lofft,
Axiom Resident Expert (Retired)