Good evening fellow Outlaw people - I had been listening to my 990/7700 with two front speakers and all sounded well. The other day, I added 4 rear speakers and a subwoofer. Now I have an annoying hum constantly. Does anybody have any advice for ridding myself of this buzz and hum?

On a side note: I emailed Outlaw tech support several days ago at 7:40 pm and Steve got back to me with a solution to the problem via email and by leaving a message on my cell phone at 9:01 pm the same night... an hour and twenty one minutes later. Now that is incredible service!