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  #1  
Old 04-04-2013, 09:40 PM
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Default sound deadening, sound proofing, sound absorption

What have you guys done to get your car as quiet as possible on the inside? Have you done anything to help tame reflections?

I've done a lot. Will post more later, just curious to see what others have done.

Good place to share tips and tricks.
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Old 04-04-2013, 09:46 PM
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I rhino lined my floor


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Old 04-07-2013, 06:43 PM
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I deadened the whole car, strengthened panels with metal reinforcements, used mass loaded vinyl+closed cell foam to cover just about every bare metal surface I could find once all the trim was off, then sandwiched a roll of thinsulate acoustic between the headliner and roof. I filled all the open cavities I could with thinsulate acoustic, stuffed the interior frame itself with polyfill, opened up the dash and stuffed every open space with thinsulate acoustic, then stuffed more thinsulate inside the backs of the seats. I wrapped as many plastic trim pieces as possible in headliner material to absorb sound and help tame reflections. Additionally, I wrapped many wire harnesses with fleece tape and put butyl rope on as many clips as possible to prevent them from buzzing.
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Last edited by Wheres The Butta; 04-07-2013 at 06:45 PM.
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Old 05-08-2013, 02:04 AM
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never dawned on me to stuff the car...lol I gutted poly out of the old couch to have around. Now I know what to do with some of it.
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Old 05-17-2013, 01:17 AM
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Quote:
Originally Posted by Wheres The Butta View Post
I deadened the whole car, strengthened panels with metal reinforcements, used mass loaded vinyl+closed cell foam to cover just about every bare metal surface I could find once all the trim was off, then sandwiched a roll of thinsulate acoustic between the headliner and roof. I filled all the open cavities I could with thinsulate acoustic, stuffed the interior frame itself with polyfill, opened up the dash and stuffed every open space with thinsulate acoustic, then stuffed more thinsulate inside the backs of the seats. I wrapped as many plastic trim pieces as possible in headliner material to absorb sound and help tame reflections. Additionally, I wrapped many wire harnesses with fleece tape and put butyl rope on as many clips as possible to prevent them from buzzing.
what exactly does that do brandon? i think i was there when you did it and i never asked lol. i wish i could say everything you have done was "overkill" but your car sounds amazing. haha.
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Old 05-17-2013, 03:03 AM
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I taped my wires to the floor with peel-n-seal.

I know it sounds horrible, but road noise doesn't really bother me. I usually listen at a level high enough to overcome the noise floor, and 90% of the time I have the windows down anyway. Now rattles and buzzes, especially ones that are sympathetic with a note...I go out of my way to kill those.

Can't really do much about reflections. I have a 3-way active stage all on the dash and it's all fabric up there. I'm getting some nasty peaks from the mids and a suck-out at about 500hz from them reflecting off of the side window, but nothing too horrible. My 8"s are firing straight up at the windshield but obviously I'm not worried about reflections at those frequencies.
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Old 05-17-2013, 07:35 PM
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One layer of 80mil CLD over everything (floor, doors, pillars, ceiling), double layer on about 2/3 of the floor to combat a noisy exhaust, CCF over the CLD everywhere but the ceiling, MLV over the CCF on the floor, and the spray-on QuietKote stuff that PE sells sprayed everywhere I couldn't reach.

A-pillars are wrapped with speaker cloth, and I have a dashmat, but haven't noticed any difference with reflections.
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Old 06-09-2013, 06:46 PM
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I had a 95 jetta at one point that rattled like crazy in the trunk and for lack of funds and availability of sound dampening stuff I stuffed some rags and such into the trunk lid, it helped but now that I've actually used dynamat and hushmat I see how little it did. Can't honestly compare the two one was for a stereo system (the dynamat) and the hushmat was used a a unimog to prevent road noise.
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