Quit being an ******* and cut him a ****in break Trey. The shop installed his shit. If the sub was BARELY being held onto the box (and in place) by the screws which were in the stripped holes how would he have noticed? I mean I would probably hear the difference if it fell out or something, but he fixed it himself anyways. He's not a dumbass. He is asking a valid question about what to listen for when you think your sub is damaged. Not his fault that he is new to this. All of us have been in this position and most of us have done FAR stupider things.