Okay here's my dillema. I've spent the majority of hte money i made last year on a banging 4500 watt audio system. 2000 watts of this is pushed by 2 12 inch subs. my 12's are so big and powerful that at first if you were outside the car all you could here was the banging of the license plate and back hatch against the car. So i dynamatted the hell out of both. Well then it got quite enough that i could hear that the shelve in the back was just slamming away as well. Dynamat 2 the rescue. Now i hear the rattle elsewhere in the vehicle. Now's its the Spare down below. Dynamat again hahaha. Then the seat backs, then the rear door panels. Does anybody know how to make the rattle stop or will this thing need to be chased from the back all the way through the car. The guy at the Audio place when i came in 4 the 4 th time to buy another wedge pack laughed and said if i seal up everything i could build too much pressure and blow a window seal.... Any suggestions?