I've been wrestling with speaker hum for a while and in the process of trying to alleviate the problem discovered something which I don't quite understand. As near as I can tell, the speaker hum (center channel) is related to the DVD player. Last night I tried moving the audio cables from the player to another, vacant input on the back of the receiver (NAD T-762). I left the player on at the time and turned the volume way down. Once I'd connected the cables to the other input ("VCR"), I started bringing the volume back up prior to switching to the appropriate input on the remote. However, even though the plugs from the DVD player were now connected to a different input on the back of the receiver, I could still hear the soundtrack of the DVD I was watching. I selected the "DVD" and "Satellite" inputs on the remote and the DVD was still audible. I tried the "CD" input on the remote but didn't get the sound through there (I have a CD player hooked up to the receiver). I also noticed that the speaker hum was now intermittent instead of constant. Anyone know what the heck is going on?? I'm thinking this goes beyond the normal issues in HT systems that can cause speaker hum. Is it possible that I might have done something strange when I assigned presets, etc.? I'm wondering if resetting everything to factory defaults might be the solution. Or is there a problem with the receiver's wiring?