Nobody have a clue as to why this would happen? My dad had a Grand AmGT with a monsoon but never encountered this. Unfortunately he's no longer with us, so I'm stuck. Fuse seems to be good. Connectors in tight on amp and speakers. If I bypass the amp the speakers will either get only bass or treble, which means having to get new speakers. As a student with a pizza delivery job, that falls behind the cat problem, which by the way has not happened again since.