Dynamat or other....

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06-14-2004, 02:17 PM

thereal7

50 Watt CAFz'r

Thread Starter

Join Date: May 2004

Posts: 65

I want to get some dynamat or equivilent in sound deadeding. I know there are some dealers here. I don't what to spend a fortune at the local store.

I want to stop vibrations in my car as well as stop outside sounds, road noise. I've heard that I should use a combo of closed foam and deadener. I have a few sheets of accumat. Not sure it it really helps. I put some in the doors, but I think I need alot more. I think dynamat is the way I need to go. Any advice would be great.

Thanks

06-14-2004, 03:42 PM

Fever

500 Watt CAFz'r

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Join Date: Feb 2002

Posts: 759

<< If you click on the B-Quiet on the sidebar you can order different types of deadening.
I have purchased 35sqft of brown bread from them twice now. Delivered right to my door for a great price.
I like brown bread but have never really tried others.
Use "cca" in the discount code and its good for 10% I think?

Gene

06-14-2004, 04:37 PM

JohnVroom

Yankee

Join Date: Oct 2003

Posts: 3,599

Thereal7 you are on the right track. The brown bread, Dynamat etc is great stuff at stopping structure born noise (damping). Because of its construction and mass it is also good at absorbing frequencies 500 Hz and below. But as you stated you need something for 500Hz and above... you could do a second full layer of Dynamat but that is heavy and EXPENSIVE. Something light with lots of surface area is best (closed cell foam should be OK) BUT the fiberglass batting or better yet a stiff fiber board material (kind of impractical in a car). I recommend 3M Thinsulate it is exceptional at HF > 1000 Hz and good from 500 and up.

06-14-2004, 05:36 PM

thereal7

50 Watt CAFz'r

Thread Starter

Join Date: May 2004

Posts: 65

Thanks guys.....looks like there is no way I can afford this all at once...so I will have to do it bit by bit.....what should I start with first?

[ June 14, 2004, 06:38 PM: Message edited by: thereal7 ]

06-14-2004, 05:47 PM

Dereck Waller

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Posts: n/a

Each car is different. Take a drive and listen where most of the noise comes from. Usually the front wheel well areas are very bad for letting in road noise, windows are bad for wind noise but there's not much you can do there. Exhaust noise usually enters mostly through the rear of the car.

As for materials I will second B-Quiet, great company to deal with.

Now for what you are actually doing with the various materials

Barrier - self explanatory, sealing holes where sound enters

Mass Loading - adding mass to an object to lower it resonance frequency, hopefully moving it to a frequency that our hearing is not as sensitive to.

Absorption - absorbing a certain frequency range.

Different materials can do one or a combination of these. For example mat products can be considered barrier and mass load products. Materials like B-Quiet L-Comp are barrier and absorption products. Spray on deadeners usually only mass load, and foams are only good for absorption in most cases. For maximum effect you will have to mix different types of products.