I recently bought the 950/7100 for my 5.1 set up and am very happy with it. With a bit of time on my hands this weekend I thought I'd try biamping the left and right mains with my two spare 7100 channels to see if it made any difference. I do think it's taken a little of the brightness from the tweeters on my B&w CDM 7NTs so I'm happy with the result, but something interesting is happening.

When I shut down the 950/7100 I'm now getting a high-to-low frequency whine coming out of my main speakers that fades to silence after a few seconds. It's not loud, and I doubt it's doing any harm (I think it may simply be a capacitor in the 7100 discharging) but I never had this before I did the biamping.

Any ideas what might be happening?

if it didnt do it before you biamped, and it does it now after you biamped, it probably has something to do with the biamping. as to exactly why, i dont know. :-)