My Outlaw amp is a few months old. During the first month when the amp got warm it would hum once in a while. It would slowly come then go. I called Outlaw. I think I talked to Steve. He told me maybe it wasn't getting enough power or there was something in the line causing the noise. I tried an extension cord to another plug on a different line and it stopped. He told me a surge protectector power cleaner would probably fix the problem. I got a monster HTS 3600 and haven't had a problem since. But just today the amp was on when I was outside. I came in and it had warmed up because it had played through a disc and I heard what I think were the coiles in the front humming in and out just like before. The monster said 118 volts. Does this sound like an issue with the amp? Please help if you think you have any clue!! thanks. - Kulleo