Well I received a refurbished MX.100.4 and just sent it in under warranty because the channels stopped working. Im not that worried about it because hopefully it should get fixed but I was wondering what you guys might think the problem is. Ive noticed channel 2 and 3 come on when they want to with channel 3 coming on every other bump while channel 2 came on whenever it felt like it. Never turned the gains up yet since I just got it. Also I noticed when I would use the fader to fade in between speakers lets say if I had it to play only the left front speaker it would play but then I would move it to play only the right rear speaker and that one would play plus the left front one. If I moved it to the center then only the 2 rear ones would play and the front one would come in and out crackling. The amp would always pop to when I turned it on after the first cold start. When I first turn the car on it wouldn't pop though.
