Hi, im looking to use some sound dedening material of some sort in my car, and ive seen 2 dypes of dynamat and othe various simliar things. what sort of options do i have other than that?

also i just installed my sub in my trunk, and the trunk vibrates a LOT and makes a little vibrating sound, when i put my hand on it, it stops, what can i do to fix that... im sure enough dynamat would fix it, but that stuff is expensive and heavy ;-). any other ideas? bubble wrap?!

thanks in advance

-Colleen

anybody... anybody...


oh yea i have seen the scoobymods thing

there are some crazy smart people when it comes to sound deadening who frequent the audio/video/security forum. they will be able to suggest all kinds of creative ways to kill rattles and vibrations.

yeah, dynamat is heavy. which is more important? sound or acceleration/handling/performance?

all of them! so the point is to find teh best cobination of all :devil:

Do a search for "dynamat" in the Audio forum.

I've got brown bread in my car. Works really well.

Edit: Brown bread for those who don't know is the same sort of stuff as dynamat. Well no, but yes. Ahh, its cheaper and in my opinion better.

check out

http://www.b-quiet.com/brownbread.html

imho $100 for 36 sq ft of Dynamat Extreme (more than enough for a whole car) is not expensive. Don't buy it at Tweeter / CircuitCity / Crookfields unless you want to put their kids through college. You'll pay 2.5x too much. I bought a bulk pack from a "Buy Now" vendor on eBay for $99 and had it at my door in 5 days.

Other people swear by other brands or product. Extreme has always worked perfectly for me.

I have a Dynamat Trunk Kit in my '00 RS that I had installed in summer 2000, shortly after I purchased the car. Yes I had Tweeter do the install, and yes I bought the Dynamat there, and no I shouldn't have. But at the time I wasn't thinking about it, I had the extra money and wasn't too concerned.

But you can save a LOT of money by buying elsewhere, even more by installing yourself (obviously).

One thing you can do first is get a few scrap pieces of Dynamat, or some similar stuff, and stick it around your brake light on the spoiler. Just unscrew the light, pull it out, and stick a few tabs on the top, on the bottom, and one or two on each side, then squeeze the light back in there. You'd be surprised how much that sucker buzzes, just by itself.

-Chris

imho $100 for 36 sq ft of Dynamat Extreme (more than enough for a whole car) is not expensive.

I've already used 62.5 sq. ft. of Raammat60 from http://www.raamaudio.com so I'd hardly say that 36 sq. ft is MORE than enough for an ENTIRE car. I've done all 4 doors, and part of my trunk and just ran out of the 62.5 sq. ft. I highly recommend Rick's product. Very nice and professional guy to deal with. You can get over 60 sq. ft. of his stuff for $99. Super deal, and about half the cost of dynamat extreme, and even less than Brown Bread. Not to mention it has also been independently rated better than Brown Bread's product as well.

Chad

Chad,

Do you know where I can view or get a copy of that comparison? I can't decide between these two options..

Thanks - Neil

Heh I've used 120+ square feet of Dynamat Extreme on my car and It still isn't as quiet as i'd like it. I still need to do the floor and front fenders if possible.

Doors, roof, trunk and trunk lid are all hella covered. 2 layers in most parts.

Raammat is the least expensive one that is near identical to Dynamat Extreme. I still think Dynamat Extreme is the product to compare to.

FYI Folks,

I stopped by the local Tweeter today, and the saleman I spoke with said you could get them to install (at their standard rate) customer-supplied Dynamat material. I'm seriously thinking a roll or two of Brownbread and having the floors, trunk and doors done up good. This way you can use the material you want that you bought at a good price, and Tweeter is responsible for the installation and anything that goes wrong with anything other than the material during it.

Hope that helps.

Myrddyn

Do you know where I can view or get a copy of that comparison? I can't decide between these two options

Check with Rick of Raammat directly, he might be of more assistance, I can't recall where I saw the results but he should know.

Chad

good thread going... lets keep up the sugestions :D

I used about 105 ft^2 of brown bread in my car a 02 OBS and it made a world of difference. definately worth the 40 pounds that it added. I would of went with dynamat except that it is way oover priced and 36 ft^2 will just cover the doors. I did the doors, floor, roof, and any sheetmetal I could find. In all it cost $150, not bad for the whole car!

Any pics?

Matt

an ever cheaper alternative is roofing material...

what you are doing are 2 things to sound deaden / sound proof:

1. changing the resonant frequency of the material by adding something to it.

2. change the material itself.

lead and concrete make great materials, but then again, they are heavy stuff. cars are coming with thinner and thinner gauge metal so the option to add material to them is the only way (although in the early to mid 90s, i saw one car in CAR AUDIO & ELECTRONICS used concrete to make his subwoofer enclosure).

roofing paper is cheap but smells. and you need to provide your own adhesive...

Just got my Big Arse Box of dynamat. Where do you guys think is the most effective place to use it for deadening road noise? It seems the guys who mostly did doors, roof, etc. aren't too impressed with the noise reduction, but the guys who did the floor are happy with the results.

Personally, I'm planning on coating the rear strut areas behind the seats and the area under the rear seat bottom. All those cables and wires are pretty pesky, though.

i did the whole rear end of my car.. really i covered every inch with dynamat. PM me with detailed instrustions on how to post pictures and i will show you what i did. It did help with sould deadining.. my 2 cents

http://home.attbi.com/~jacoberickson/wrx/install.htm

That is my stuff a while back. Only have pics of the trunk. Have the doors well covered but didn't have a digital camera when I did the roof.

Thanks, Jakezor... I saw your pics from a search I did earlier. THat's some slick dynamatting under the trunk lid! What do you think helped the most? Might be hard to answer since you probably did it all at the same time, but hey, might as well ask :)

Originally posted by subaru mike
i did the whole rear end of my car.. really i covered every inch with dynamat. PM me with detailed instrustions on how to post pictures and i will show you what i did. It did help with sould deadining.. my 2 cents

You can't really post pics u have to have them hosted somewhere if you want you can email me the pictures (please no bmps , convert it to jpg or gif even windows' paint can do it) and ill host them on my server and post them here.
Heres my email axan@attbi.com

Originally posted by Carbon
Thanks, Jakezor... I saw your pics from a search I did earlier. THat's some slick dynamatting under the trunk lid! What do you think helped the most? Might be hard to answer since you probably did it all at the same time, but hey, might as well ask :)

Thanks Carbon, it took me several afternoons to do the trunk as complete as I have it.

The trunk lid has almost an entire 2 door Dynamat Extreme kit on it! Thats about 12 square feet. I did all that you see and on the upper skin that is the top piece too. I plan to have some piece made to cover up all of the dynamat, either painted body color or carpeted to match the trunk.

For general sound deadening I think the roof does the most. It gets rid of the "tin drum" sound whan it rains and mutes some of the wind noise too. I kinda think it bring the whole "noise floor" area down to the lower door and floor.

Then I think the doors are next, they cover more general noise up and move the noise source farther down. Dynamatting the doors also helps if you use door speakers (I have kicks though). The nice thunk the doors make when shut is also quite satisfying.

Unfortunately I still don't have my stereo done (need to build an amp rack) so I cannot comment on the trunk stuff.

I did the roof first, then the doors, then the trunk. I still need to do the floors (when its gets warmer here in MN or when I get my own garage).

Check out my main site if you want to see the other stuff I have: http://jakezor.doesntexist.com.

Jake

Whoa! I just got back from dinner and was so dumbfounded that I had to post this... I did the trunk lid (not as impressively as you, Jakezor, I just did the upper inner skin and a small patch on the outer skin) and it seemed to make a minor difference in noise level. Then, I did the back of both rear wheel wells, still with only a minor difference. Today, right before dinner, I did the front of both wheel wells (the part that the back seats rest against), along with the strut tops and 1/3 of the part under the seat bench. Suddenly, it's almost eerie how quiet it is :eek: Almost no road noise AT ALL up till around 45 MPH. Keep in mind I still have my back seats out (so all the noise in the trunk is still coming in)!

I wish I did this more scientifically so I could pinpoint which part had the most noise reduction. Since i did a bunch at once, all I know is that at least one of the spots I mentioned made a BIG difference. I'll post pics when I have access to a camera.

Question on how much Raamat everyone is using on their trunk. I used nearly 2/3 - 3/4 of a roll for the trunk and under the rear seats. I used 2-3 layers most places. I even did the inside of both rear fender wells as far as I can reach.

Now my question: Is this about what everyone else is doing? Or did I go overboard as usual? Is there anywhere else that really keeps out the road noise?

I will be doing all four doors, roof and some of the floor next week. All told there will be 2 rolls of the stuff in my car.

Larry