dvzzz -- you don't need a line conditioner for the 7100 to work correctly, but it should quiet the transformer hum (unless your unit is defective). The Outlaw might be humming when the others don't because of its toroidal transformer design. My Sony ES receiver never buzzed, either.

I just received my $189 A/C conditioner this morning, so I'll know by tomorrow if it does the trick and will post on 5/21 with results.

Yes!

The Ah! offset killer/line conditioner works like a charm!

The buzz has been banished, the noise floor is much lower, and the dynamic range is noticeably wider (stronger bass and smoother highs).

Best $189 I've spent on my system.

Glad that worked for you Spencer, I just noticed that unit in surfing the web and a lot of people with your problem said it fixed it also.

I also have a slight hum in my unit. My hum has to be from dirty power because it isn't always there. It will be there when I turn it on but then will disappear and reappear when it is on. My Parasound that I replaced used to intermittenly have a hum also that when it was there was louder than the Outlaws. I didn't think it was possible because I loved my parasound, But the Outlaw sounds even better than the Parasound. Cleaner, clearer, and a more uniform soundstage all around.