Yeah, I figured that much. It sticks real good with high heat.
Sound deadening isn't a waste of time. I'd rather do that than spend tens of thousands more on a car I can't afford.

 

HEHE, I bet the Shelby had to be pretty dead when you first got it eh? Musta felt like being in a cadillac LOL

Ever sat in a Plymouth Laser? that's the deadest car ever Right up there with Chevettes L

 

I remember when we had DMAC's WRX in at radioactive, all of us standing there in awe when lee shut the door. That thing is DEAD. Especially for a new car...we all know how they are building them these days.

 

Dynamat and the like are dampening materials and good at it. They couple with the metal and make it more rigid and dampen vibrations. But the goal is not only to make your cars sheet metal vibrate less, the goal is also to stop as much outside noise from coming in. They excel at stopping low frequencies from entering (good for road and exhaust noise). But to block out the full audio spectrum that is being discussed here the use of noise diffraction, noise absorption and noise cancellation can be used. To design noise cancellation is tough in a car (or anywhere else) and is seldom used. Adding odd shapes that reflect sound away from the listener is diffraction (this is the same principle as stealth aircraft though the use absorption and radar invisible materials). That leaves absorption, which dynamat does poorly above a fixed frequency (I am guessing 200 Hz their web site might have this) to address this area, the bulk of the freq spectrum, a light weight material usually fibrous (like the felt-like stuff in cars, or spun fiberglass, or 3M Marine Thinsulate) is used. They, like Dynamat, convert sound energy to heat by trapping the sound waves in a fibrous labyrinth. They are less effective if compressed and like this type of thermal insulation need the air entrapment. I use Thinsulate and it is effective from 1000 Hz up. It is like attic fiberglass except it isn’t glass, and doesn’t make you itch and it weighs much less than fiberglass inch for inch. How does it affect sound... picture a heavy snow coming down ever notice how cars are very quiet, that is due to the snow attenuating the sound. To get the same affect with a dampener you got to use a lot of Dynamat.

So my point [img]graemlins/deal4u.gif[/img] is to use several things to stop noise not one. Mass loading is good (some use cement like stuff), using all the tools is better lighter and cheaper.

 

HA yeah!

I din't see this until now.

She knows now but she wasn't impressed!

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