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Old 03-28-2004, 11:48 AM   #1
420WRX
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Default Sound Deadening

Anyone here had an good results applying sound deadening materials to doors and trunk? If so what were the key locations and what material did you use? I don't want to spend hundred$ and find out that it does very little to improve the rattles..

I'd post this in the audio forums but all my posts scroll off the first page before I get a reply.. :P

I just got my last amp, my upgraded 6.5" speakers, and I'm going to run wires today for the speakers and RCAs... I also have to get a battery isolator and run some wire for a charging circuit to the battery in my trunk..

I know I've asked, but if anyoine has found a goot area to run power cable to the trunk, please share!
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Old 03-28-2004, 12:19 PM   #2
tora
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I take sound deadening out, road noise is cool, and car becomes lighter. Sorry, doesn't help your post but..wanted to say it.
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Old 03-28-2004, 12:26 PM   #3
Necromancer
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Yeah, that's about right.

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Bah, I think a little sound deadening in the right places makes the music sound much better.

Just FYI, if you decide to go with Home Depot special asphalt sheets as an alternative to Dynamat, yes they work great at 1/10th the price ... BUT, once it gets hot, the inside of your car will smell like tar! Actually, this is true to some extent with Dynamat, too, since it's basically the same material. It takes about 6 months for the smell to go away -- it didn't bother me much but it's noticeable.

Sound deadening spray seems like a good, choice, but I have no idea how well it works. Just be careful to mask off your window motor and stuff if you're doing the inside of your doors.

My next project is to go to one of those Foam Stores and see if they'll sell me some of that Scandinavian Memory Foam or whatever they use to make those squishy expensive pillows. I have a feeling that could work and still weigh next to nothing. Could use some in the chassis structure around the back seat in the coupe...
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Old 03-28-2004, 01:21 PM   #4
alexs001
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the easiest stuff I ever worked with was the deadening mats from Cascade Audio Engineering. When you heat it up with a heat gun, it contours around panels easily.

I found dynamat was too expensive and no better, and dynamat super (with the layer of foil on top) burns the crap out of your hands when you try to apply it with heat.

I'm also a fan of expanding foam in places where you won't see it.
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Old 03-28-2004, 03:20 PM   #5
DEVO-2nd GEN
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Got some cheap asphalt ones with aluminum backing off ebay.

from what i've read before, the most effective place to put them are floor pan, roof(esp. for wagons)
then doors
trunk isn't that big a deal, but trunk lid and the wire inside the spoiler rattles a lot. so foam for the spoiler.

just start tapping your panels if any particular place sounds really hollow then stick something there.

don't over do it, doesn't help and weighs the car down
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Old 03-29-2004, 11:53 AM   #6
420WRX
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Well trunk rattle is my primary concern right now.. But on Tues I'm getting some pro 6.5" speakers for the doors and I suspect I'll be looking at treating the doors for rattle at that point..
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Old 03-29-2004, 09:58 PM   #7
420WRX
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Oooh and what is this about a spoiler wire and some foam? Is this the wire for the LED?

Foam sounds like an easy treatment, but there should be a better way.. like running it through a long section of heatshrink?
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Old 03-29-2004, 10:20 PM   #8
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Go to candian tire and get your self a couple cans of undercoating... apply where the problem is, let set, and voila! rubberized sound deadening.
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Old 03-30-2004, 12:44 AM   #9
420WRX
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Hehehe.. Thanks for the advice, I'm sure in most cases that would be the best way to fix it without going over weight or over budget.

My problem is that the WRX has to be done the 'right' way, even if it's more expensive. That's why there's a better battery in the trunk, for the stereo(and my 'other' electronics), than there is under the hood, for starting the car. Heck the cable running from my rear battery to my 20watt amp is thicker than the cable running to my starter. It's just sick.. I tell people to grin+nod, and I guess they have been there about something like this at some point so they sorta understand..

Oh and don't get me wrong, I could take the trunk apart, take the lid off and mask it all and apply the coating.. Add a light layer of some material to seal the stink off a bit.. To be honest that wouldn't be too much work, and it would be the right way to do it.. But I am still making lots of sacrifices to keep the car intact and easily revert'able back to stock at any moment. Sucks. I know.
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Old 03-30-2004, 06:49 PM   #10
alexs001
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Quote:
Originally posted by 2fcknfst
Go to candian tire and get your self a couple cans of undercoating... apply where the problem is, let set, and voila! rubberized sound deadening.
that stuff goes on so thin, it's not useful as sound deadening...makes a good undercoat though
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Old 03-30-2004, 08:09 PM   #11
Necromancer
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Yeah, that's about right.

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Agreed, just because something is rubbery doesn't make it a good sound deadening material. The key is it has to be a viscoelastic material. That's the difference between a foam pillow that bounces back right away and those Scandinavian pillows that sort of have a gooey consistency and maintain the shape of your hand when you push into them.

I wonder if there's a decent local source for NoiseKiller spray...
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Old 03-30-2004, 11:02 PM   #12
paul pfeiffer
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Default hello

i used dynamat, i bought the trunk kit as well as the wedge pack. i still have an extra wedge pack if you are interested. it's in the box and everything, i will sell it to you for half price.

p.s dynamat works very well, i've had it for a year now.
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Old 03-30-2004, 11:13 PM   #13
alexs001
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Quote:
Originally posted by Necromancer
Agreed, just because something is rubbery doesn't make it a good sound deadening material. The key is it has to be a viscoelastic material. That's the difference between a foam pillow that bounces back right away and those Scandinavian pillows that sort of have a gooey consistency and maintain the shape of your hand when you push into them.

I wonder if there's a decent local source for NoiseKiller spray...
not to be a total cascade sackrider, but they make a good spray-on: http://www.cascadeaudio.com/prod/vb1.html
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Old 03-30-2004, 11:23 PM   #14
fukamoto
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How much would it cost to dynamat the entire trunk?
I get crazy rattle.
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