I've replaced my entire system and have 4 Pioneer 6x8's and a sub in the rear (see sig). I've had a lot of rattling in the doors especially with my drivers' side. Has anyone used the sound dampening stuff before? Easy to use? Does it work? Worth the $$??

Opinions please. Thanks


99 Black SE Sport ATX
Running on E1 SVT rims with Dunlop rubber
Pioneer DEH-P3100 CD receiver (2 channels of the amp blown, officially declared dead)
Pioneer DEH-P440 CD receiver
Pioneer TS-6865 6x8's in the front
Pioneer TS-6867 6x8's in the rear
Pioneer TS-WX121 Sub with a Pioneer GM352 amp feeding it