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Message: <blockquote data-quote="whitedragon551" data-source="post: 8487103" data-attributes="member: 608181">This.In short there is Dampener, Closed Cell Foam, and mass loaded vinyl.The basics are the dampener needs to have a butyl back for this to work best. It absorbs the vibrations caused by speakers and road and turns them into heat which is then dissipated via the aluminum layer. The thicker the aluminum and butyl the better it will deaden. The closed cell foam is used to prevent rattles between layers in the door, pillars, etc. and mass loaded vinyl is to prevent outside noise from coming in and vice versa.</blockquote>

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