Possible amplifier/subwoofer/wiring problem?

well like you said the problem may be the amp itself...aside from that the only thing i can think of is check your ground wire...make sure it is connected securley to bare metal on the chasis of the car....if there is paint between your ground connection and the chasis then i would sand it down to bare metal and see if that helps

hope this fixes your porblem

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My guess is that there is something popping out of place inside your amplifier, and when you hit it with your holy hand, it somehow fixes it?

Try moving your amplifier to another location so it can be laying flat on a surface.

i would ask an expert.

try circut city they have lotsa stuff for cars