I'vegot an MTX Thunder amp (not sure wattage) running four 10" subs in a box under my backseat. The subs have now pretty much cut out completely, occasionally coming on for a few seconds at a time. <BR> <BR>If I put my hand on the subs, I can feel them vibrate very faintly. Each has it's own wire running back to the crossover, so it isn't the connection that has gone bad/ come loose. That would mean only one of the four would go out at a time, right? <BR> <BR>Since they're either all working, or all not, I'm fearing the amp my have gone out or something. Anyone know what may be the problem?