I have an 04' tahoe and i have a JL W7 in a H.O. box installed and it rattles the plastics in the back so bad that it is not even enjoyable to listen too. i thought about dynamat or some other cheaper substitute for dynamat but i am not sure where to apply it. do i put it on the back of the plastics or where do i put it. i would only like to spend around a $100 or so and i live in pa so constant heat is not really a problem for me. could somebody please give me some advise. thanks