Can we talk about sound deadening products?

[redfire69]

Originally Posted by Bryan O

To broaden the scope of this topic a bit, is it unwise to apply Dynamat (or any of these products) on vertical panels?

Years ago when applying Dynamat to my Camaro I was told it is risky to do the doors. That the product would not hold and would "slide" downward. Is this true? I am doing a Chevelle soon and would like to know. Also, I noticed Malitude has Dynamat inside the doors.

I used dynamat extreme on my doors with no issue. 10 years and no movement yet. Ron

[Bryan O]

As always, awesome info/knowledge shared at Lat-g.

[preston]

Originally Posted by WSSix

www.sounddeadenershowdown.com for information about controlling sound in your vehicles including comparisons between different materials.

Yes, read that site. Dynamat and the like are really only for cutting down resonance of metal panels and some (very mild) heat rejection. The mat itself has very little resistance to sound waves travelling through it. Unfortunately, any product that does actually attenuate sound (vinyl mat or dynamat extreme) is very heavy. I've heard it said that a 10% open area will let through 90% of the noise too. The audio guys dynamat as needed on the open metal, and then lay down a full covering of the heavy vinyl mat (and they also put a closed cell foam layer in between for "de coupling" although I don't really truck with this, especially if you are putting carpet over it.

So use dynamat, but you don't need to plaster the car with it like on the shows and photo shoots, that is more of a sponsor thing to get you to buy more dynamat. And then, you can experiment with dynamat extreme or vinyl mat over wheel wells and trans tunnes and firewalls, balancing weight and noise as you see fit.

I'm with some of the other guys, I have tried many products and keep coming back to dynamat for various reasons. But I haven't tried boom mat. That sound deadener showdown site is the place to read if you really care about this stuff.