bad sound rattle need help
 

k so i got 2 12" jbl's and a little bit of bass causes a bad rattle against the back window from the back of the seat carpet stuff as shown here...
(NOT MY CAR) example only
http://i158.photobucket.com/albums/t...88_54_full.jpg

looking for advice of what to do to prevent it from rattling against window. dont say dyna mat cause i dont want to use it, just looking for other possible ways of stopping it. anything cheap diy ideas????

Shove some foam in there?

dont think it will work. i was looking at peel + stick roofing membrane but it doesnt feel that sticky. dont think it will hold a stick to the metal in the trunk. any other suggestions guys or anyone who has used roofing membrane??????

I just stuck carpet pad in mine. Just enough that it tucks down so you can't see it. Hasn't rattled since.:)

You could try some self-adhesive foam pipe insulation. It comes in rolls and is pretty cheap.

where u buy that from?

ACE hardware / Lowes / Home Depot / Etc

sound deadener is for killing ringing and lowering resonance, not bracing rattling parts :) common misconception.

Try some weatherstripping, carpet padding, or other foam.