AL,
Sorry to have opened up the can of night crawlers about the fuses! Up here in Gods country we rig boats for fishing and put 40-50 amp breakers on trolling motors that can be reset when they trip. Maybe that would work or the old auto mechanics trick you wrap the fuse with tin foil and wait for something to smoke to help locate the problem. Cutting edge no matter how you look at it. Someone should make a small traffic light for speakers, mount on top like an old Altec horn---green keep playing and turn it up, yellow be careful the thing is gonna blow, red you have sold the farm, please have credit card ready.