View Full Version : Sound Damping for the VX

07/23/2003, 10:52 PM
I'm interested in sound damping my VX. I'm in the process of installing a pretty heavy audio system and need to quiet down the interior a bit (especially after installing the PV Muffler!). I know a few people here have done this, so any advice would be appreciated.

I'm considering using a B-Quiet product, either Extreme or Brown Bread, but it's quite expensive and I don't know if there is a cheaper product out there that will do as good of a job. Also, I'm planning to do the doors, floor, rear door, and possibly the interior walls. I don't know how much I will need, and if I should do the head liner or hood.

Some specific questions: if you have already done this, what product did you use and how much did you need? To what parts did you apply the damping material? Are there any spots that would benefit from extra layers?

07/24/2003, 12:42 AM
I believe it takes 3 of the biggest boxes of Dynomat Xtreme, to do the whole thing

07/24/2003, 08:02 AM
Originally posted by AlaskaVX
I believe it takes 3 of the biggest boxes of Dynomat Xtreme, to do the whole thing

So that's about 100 sq.ft. or so. Does this include doing literally everything, i.e. under the hood, under the dash, A pillars, etc. or just hitting the big parts of the interior (i.e. floor, doors & headliner)?

Also, is it difficult to remove the headliner and interior side panels?

07/25/2003, 07:55 AM
I used about 36 sq. ft. of Dynamat and she is quite sound. I didnt do anything forward of the front seats except the doors and I am pleased. Too much Dynamat holds in heat (good for winter, bad for summer) and adds a HECK OF A LOT of weight (ya ya ya, slightly exxaggerated :p ).

All the aches and pains of installing it are worth it though.

07/25/2003, 10:51 AM
I think 3 boxes covered the roof sides and floor of the VX. Not behind the dash or hood. I wish I could get a hold of Boarzhead since his install is the one I'm talking about.

07/25/2003, 03:23 PM
So it sounds like a 70 foot roll of Brown Bread should cover the floor, 3 doors and interior walls, right? I'm thinking I might skip the headliner, as not much noise is introduced from above and that might let some excess heat escape. If I have some left over I'll work my way up the firewall, and if I decide to door the hood I'll probably buy one of the thicker materials that was designed for under hood applications.

So is anyone familiar with the B-Quiet products? I've heard nothing but good things about them, reviews have given them better scores than competing products, and it's a lot cheaper than Dynamat. Maybe it's just not used as much in the 'States because I think the nearest supplier is in Canada.

07/25/2003, 03:34 PM
Ya, that sounds right to me, but if you ever plan on putting a system with a powerful sub in there then you should definately do the roof. I have 2 Sony Xplod 12"s and it shakes the hell out of my roof, I have to open the back door at party's or it sounds like crap.

07/25/2003, 05:41 PM
F-Dynamat...... go with Cascade! It's a much cleaner install. It doesnt have the sharp edges that the dynamat foil has, and its cheaper!!

07/25/2003, 09:54 PM
Yikes! I am working on a high end car audio install as we speak- one of my main reasons for the sound damping. I suppose I need to include the roof in my install plans also then. It would be much easier to do it when I do the rest of the VX, and it sounds like I'm going to want to do it.

As far as holding in heat, does it generally work as an insulator? In other words, will it also hold in the cold if I'm using the AC?

07/26/2003, 11:35 PM
I'm thinking about installing some kind of sound dampening material in my VX (floor, doors, etc.). Wondering how much dampening material I can fit under the carpets without too much trouble... half an inch maybe? or more?

07/27/2003, 01:36 AM
Take a look at Cascades products, they have a liquid sound deadner that can be sprayed on, and it doesn't reek of MEK fumes either, its water based. They also have a thermal ceramic barrier compound that has impressive R qualities even in thin layers.



John C.

07/27/2003, 10:05 AM
Hotsauce - How well do the cascade products compare to Dynamat and B-Quiet products?

SPAZZ - You can get 100 feet of B-Quiet Extreme for about that same price off E-Bay (plus shipping). And a 70 foot roll of Brown Bread is about $125. Everything I hear indicates that BB is a lot better than Dynamat. I just wish someone could tell me something about BQ Extreme, but I can't seem to find anyone who knows anything about it!

07/28/2003, 06:41 AM
Yeah, eBay has Dynamat for just under $100 for the 36 ft. roll - usually around $97-98 plus shipping.

What is a side window wind guard?

07/28/2003, 06:46 AM

You find the ones for the VX at www.weathertech.com

Here's another thread (http://www.vehicross.info/forums/showthread.php?s=&threadid=1437&highlight=deflector)

07/28/2003, 12:29 PM
Hey kpaske, I would install the system while you still have the headliner off. I say that since the roof has sooo much flex to it and you might even need to double up on it. But, I would wait and try it with one application and if it still moves with that horrible vibration throw another on.

07/28/2003, 05:54 PM
You must use a particular Dynamat (not the bottom or mid grade) for the roof to withstand the excessive heat - see their web page for more info. Don‘t forget to compare the specs when looking for ’discount’ materials - there is a big difference even within Dynamat’s own product line. All sound dampening materials are NOT the same.

07/28/2003, 06:09 PM
Tone - What specs in particular should we look for? I've read some reviews, but I don't know much about the way these things are measured. Also, the special application is for under the hood, not the headliner, right? Or does the headliner need a special type of damping also?

07/31/2003, 05:13 PM
I did a little research and here is what I've come up with.

Dynamat Extreme:
Description: a viscoelastic elastomeric butyl and aluminum
constrained-layer vibrational damper.
Installation: no heat required
Odor: none
Price per sq. foot: $3.47 (based on price of $125/36ft)
Thickness: 1.14 mm (.0044 in.)
Mass: 0.45 lbs/sq.ft.
Acoustic Loss Factor (ASTM method E756@ 200 Hz):
0.240 @ +32F (+0C)
0.257 @ +50F (+10C)
0.417 @ +68F (+20C)
0.259 @ +86F (+30C)
0.194 @ +104F (+40C)

Brown Bread:
Description: a viscoelastic deadener with a supercharged
bitumen based adhesive, an aluminum constraining layer and
a unique composition with suspended mineral particles.
Installation: heat required
Odor: tar-like
Price per sq. foot: $2.14 (based on price of $150/70ft)
Thickness: 1.60 mm
Mass: 0.40 lbs/sq.ft.
Acoustic Loss Factor (ASTM method E756@ 200 Hz):
0.230 @ +32F (+0C)
0.260 @ +50F (+10C)
0.390 @ +68F (+20C)
0.320 @ +86F (+30C)
0.240 @ +104F (+40C)

B-Quiet Extreme:
Description: a thick composite mat which consists of rubberized
asphalt with an aluminum constraining layer.
Installation: ???
Odor: ???
PRice per sq.foot: $1.25 (based on price of $125/100ft)
Thickness: 1.15 mm
Mass: 0.30 lbs/sq.ft.
Acoustic Loss Factor (ASTM method E756@ 200 Hz):
0.160 @ +32F (+0C)
0.190 @ +50F (+10C)
0.290 @ +68F (+20C)
0.200 @ +86F (+30C)
0.140 @ +104F (+40C)

I searched for specs on RAAMmat, FatMat, RattleTrap, Thundermat, Cascade GatorSkin, and SecondSkin but could not find enough information about them (particularly the acoustic loss factor) for a fair comparison. Whenever possible I took data directly from the manufacturer's web site.

The data above shows that Dynamat Extreme is more expensive, heavier, and only deadens sound better than Brown Bread at its optimal temperature (~68F). It is easier to install, thinner, and leaves no odor.

Brown Bread on the other hand, is cheaper, lighter, and deadens sound well throughout a range of temperatures. It is, however, thicker, more difficult to install, and leaves a tar-like odor. I've also heard reports of the adhesive leaving a residue, and even loosening at higher temperatures.

The B-Quiet Extreme is obviously much cheaper, but also doesn't even compare to the other two in sound deadening ability.

The data would lead me to believe that the Brown Bread product is overall a better value, however, the odor and possible adhesion problems leave me a bit hesitant, so unfortunately I'm still undecided. What do you guys think about this?

What I've also come to realize is that all of these products are designed for vibration damping rather than sound damping. It seems to me that, although important, vibration damping is really only necessary in areas in the car that are subject to high vibration (such as behind speakers). Wouldn't it make more sense to cover the entire car with a sound deadening layer (like LComp,VComp, or Dynaliner) if my goal is better car audio sound and less outside noise?

12/27/2003, 10:08 PM
I am with KPASKE on that one. The optimal performance is for sound, not vibration, so maybe a little Dynomat Extreme in the door and rear door, where the subwoofer is and then Dynoliner in the rest of the car...

Does that sound right to others?

12/28/2003, 09:11 AM
Vibration is sound, just a lower frequency.

Some of you have seen my roof flex, and bounce keys, coins, and cups of water off when I crank the sound up.

Sound deadening, whatever brand, makes a HUGE difference in the clarity of the bass, and add to the overall blackness of background noise.

John C.

12/29/2003, 12:10 AM
Yeah, I wound up using Brown Bread all the way around, in addition to a layer of VComp in the rear and HLiner under the hood. The difference is incredible. The coolest thing is I can crank it way up inside and you can barely hear it outside until you open a door. You can still hear the highs a bit if it's really blaring, but there is zero vibration to spread those lows anywhere except where they're supposed to be.

12/29/2003, 12:41 AM
so how much did u acutally need to cover the whole car?
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12/29/2003, 07:28 AM
I used:
(1) 70 Foot Roll + (1) 35 Foot Roll of Brown Bread
(1) 35 Foot Roll of VComp
(1) Large HLiner

In retrospect, I'm not sure how much effect the VComp really has on the overall sound deadening because immediately after the install I didn't notice much of a difference in the rumbling coming from my PV muffler (which it was mostly intended to cure). However, the 105 ft of Brown Bread was just barely enough to do a single coat on nearly every interior surface. Two 70 foot rolls would have been preferable to get more of the inner door and sidewall surfaces, though I don't know if it would make a huge difference. My VX is pretty well dampened ASIS.

On Your Left
12/29/2003, 07:42 AM

How long did the install take you? And what diffulties did you encounter? Also, what about the odor? Did it go away? Any regrest on the brand you chose?


01/05/2004, 11:38 PM
Starting early one Saturday morning, with my wife's help, I was able to disassemble, wipe down, apply all of the Brown Bread and the Hliner, and partly reassemble before nightfall. We probably could have completed the project if we started at daybreak, but I had some wiring and such that I wanted to do the following day anyway.

I haven't had any issues with odors at all. Since I did it in the summer, it was already warm, so I didn't need to apply heat and didn't have any problems with adhesion or spreading it into the corners and tight spots. The whole project went quite smoothly. I do recommend poking all the screw holes through as you're laying out the material, as they are very difficult to find once all the surfaces are covered.

Definately no regrets using Brown Bread. The stuff is great, and provides an excellent audio environment. There are certainly cheaper options out there, but I think it gives you the best value for your dollar if you're looking for a high quality product.