I have put three layers and built custom baffels for my amped 6x9's. I still have a lot, and I mean a lot of vibration from beind them. It is from the amout of output they have, not the mounting. The baffels fixed the speaker itself from vibrating, the dynamat made them bassier, and eliminated the vibration from that area. Now the noise is sent down the back and into the door. I double layerd the interior of the door with dynamat and the whole way back(talk about a pita). N e ways, the sound still carries too much and causes the body of the car itslf to vibrate. Will polyfill shorten the legnt of the sound travel? I noticed this elped a lot with my subs, but wasn't sure of the 6x9's. (I already fixed the door vent thing too) I appreciate the info...pics on the way.

 

IMHO, i would say that the polyfill will not help reduce the rattles.

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-Justin-
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