Well, turned Amp on today and now seems to be white noise that wasnt there before coming from it when volumes low. its nioticeable. went through checked all connections etc alls good.swapped out lets etc. My gain is set i guess to 26 all the way counterclockwise. Running it in PBTL with 48v dc supply. It was dead silent. Not sure what deal is now. These amps are frustrating at times.