Will- Did you ever try to attach a ground wire to the 950's chassis?

I also get a hum from my 950, but I can only hear it if I put my ear up against the speaker at any normal listening volume. (Don't use much DSP except for the CES modes watching movies...) My 1st 950 also hummed, but I didn't recognize it until I got the 2nd one, because the hiss in the 1st one "overrode" the hum.

I did finally run my cable TV line through an isolator in my balanced power AC unit, but didn't help much more than the kludge solution I had before (run the cable coax line through a 300-75-300 ohm conversion; or maybe vice versa).