Dynamat or other....
Thread Starter
50 Watt CAFz'r
Joined: 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
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
<< 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
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
Yankee
Joined: 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.
Guest
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.
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.
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