I'm stumped with the hum... I have all components plugged into the same circuit. I unplugged each component, then speakes, one at a time, powered up the unit after each connection was removed, and the hum was there until the last speaker was unplugged. Obviously there was no hum when there were no speaker connections. I don't think its a ground loop issue b/c I didn't have a hum with my Denon unit. I believe its an analog thing and associated with the internal fans on the unit. They are audilble when the unit powers up...
The weakest link is the power stip I have the components plugged into, but that'll have to do for now.
The only analog connections are an s-vid from the NAD to the TV, the component out from the 2900 to the NAD, and the 5.1 connection out of the 2900 to the NAD. All else are digital (DA-30mkII, 2900 for redbook, Charter digital cable box has a digital out).
I don't remember it being nearly as noticeable until I connected the unit to the TV for set up. The first few days I had it, I just plugged it up an went with it. Then I made a video connection from the TV to the NAD so that I could use the onscreen display to set the speaker distance, etc... that's when the hum became more noticeable to me anyway. I may have just not picked up on it until then, and I'm thinking this is the case.
The sound is just great, but the barely audible hum grates on me when watching TV. Any help would be greatly appreciated!