Sound Deadening

[TK85]

Planning on doing a stereo upgrade and while in there I am going to be sound deadening the doors and back wall. I always used dynamat years ago but wondering if they are still the top of the lineup. Was debating between that or Focal Bam which I haven’t heard of until recently.

 

[The Car Stereo Company]

thats what we use on all the higher end builds we do. focal bam and black hole tiles

 

[The Car Stereo Company]

guess the other pic didnt show

 

[dhmcfadin]

Definitely don’t lay dynamat over where the Vapor barrier goes. EVER! If the door, locking mechanism, window, etc ever has to be serviced, the person doing the service will have to cut all of that material out and you will be sol.

Do it the right way and build replacement abs or aluminum vapor barriers. If using ABS, which I recommend, it takes all of 15 minutes to make them.

See pics.

 

[xxaarraa]

Interesting thread. I have used dynamat on many vehicles also, not to enhance audio quality, but to reduce NVH. Usually, the biggest bang for that buck is floor pans and wheel wells.

Also, what about doing a two layer job - CDL first, then MLV on top. Is that better than dynamat, which is a one stop shop type of item correct.

 

[xxaarraa]

Ok so I got the CLD and MLV in, for a dampening project on my new car. I will be using it for the floor boards and firewall mostly, but may also do the doors. Will post up results and pics later.

 

[Edbert]

For anyone considering this that has no experience, I think there's one thing that should be said.

This stuff is HEAVY, as in seriously heavy considering how thin it is. I understand the extra hundred pounds might not matter to many, and on a 3 ton truck it is less significant than many passenger cars. But I (originally did not understand the weight of these stick on sound deadeners) bought a bunch of the stuff for my hot-rod and decided to live with the noise rather than add 100 pounds to a 2,800 pound car.

 

[xxaarraa]

For anyone considering this that has no experience, I think there's one thing that should be said.

This stuff is HEAVY, as in seriously heavy considering how thin it is. I understand the extra hundred pounds might not matter to many, and on a 3 ton truck it is less significant than many passenger cars. But I (originally did not understand the weight of these stick on sound deadeners) bought a bunch of the stuff for my hot-rod and decided to live with the noise rather than add 100 pounds to a 2,800 pound car.

Very good point. Yes, it adds weight and it's always an NVH versus weight trade-off.

However, you won't use 100 lbs of sound deadening in a car, unless you cover it top to bottom with the stuff. On a 5600 lb truck, ~50 lbs of sound deadening won't make any noticeable difference.

 

[Edbert]

FWIW I was looking at lining the entire passenger floor, trunk-floor, trunk-sides (bare sheetmetal fenders sitting right there) trunk-divider, wheel wells, front fenders (sort of the wheel wells), inside of doors, and the firewall where possible. At least on a convertible the roof was not an option.

A 52 year old car with about 2.5x the horsepower it originally had, and full poly suspension with stiffer springs and shocks plus a 3" exhaust with long tubes, and stiffer/wider tires makes a lot of noise. I still do not have a stereo in it because, well, one cannot hold a conversation in that car at speed to begin with. I'm not sure the 100+ pounds of Dynamat would have made as much difference to ambient sound as it would to my 1/4 miles times ;-)

But that is a different paradigm from what is being discussed, no intention of hijacking.

 

[autokraftgt]

Ok so I got the CLD and MLV in, for a dampening project on my new car. I will be using it for the floor boards and firewall mostly, but may also do the doors. Will post up results and pics later.

You're gonna need a decoupler between your CLD titles and your MLV....Closed cell foam works great. The MLV needs to be decoupled in order to "block sound"
Also, if there are any resonances left over, IF the MLV is in direct contact with the resonances, the resonances will pass through the MLV if there is not a decoupler in place..
Sheets of CCF are cheap