Hey Everyone, Searched here to see if someone already had my problem, but haven't found a solution that works. Heres my issue..... I have a Genz Benz ShuttleMAX 9.2 (which I LOVE). On my last two gigs, I've had disturbing issues with a loss of low end/signal and background crackly distortion (seeming to be "underneath" my bass sound). I thought it was poor power, but it happened the same way at both gigs. Initially, the amp would seem to have a very weak sound, I would try to compensate by turning up the low end and gain. About 3 songs in, It would seem to get much louder and would be peaking. I'd turn it back down, and it would seem to be okay. I took it home and experimented. I'll share my results and see if it points to a solution. I switched out cables and basses and used the headphone jack in the amp, I tried both FET and Tube channels at various volumes. I got the exact same distorted background sound regardless. I would tap the top of the amp (as one does when you're diagnosing an issue) and the sound would go back to normal. I could then recreate the sound by tapping it again. Obviously, I want to fix the issue so I don't have to do that. One interesting side note: When the amp is distorting, the "signal" LED light on the front of the amp will stop working, (or stop being as sensitive). It usually comes on when there is any sort of playing, even light. I could get it to turn on, but only with heavy/hard playing. Tried twisting the cable on the input jack and there was no loss of signal at all, so I ruled out a dirty jack. Any ideas what it may be?? thanks!!