sound deadening review and stickied?

Rockhound

That's probably because most of these products mentioned are just the dampening layer. I found that out the hard way in a previous car. Loading up on a dampener material is going to be disappointing as it is just one of three layers needed to cut down sound waves.

A three layer approach is the most effective at sound deadening; you need a dampening material first, which is what almost every 'dynamat-esque' product is. This layer primarily reduces panel resonance, but lacks the mass to effectively reduce noise, it's just the physics of sound propagation - and a little goes a long way. Second you need a buffer layer of closed cell foam. On top of that you need a barrier of something with some heft, like mass loaded vinyl - this is a crucial layer for significant reduction.

I did tons of research on this stuff anticipating needing it in my Z that was on order, but after owning it a year I've been fine with the noise levels. One helpful website I found for this stuff is Sound Deadener Showdown - this guy has put together a fantastic breakdown of each layer and the reasoning behind it.

http://www.sounddeadenershowdown.com/


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