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Originally Posted by Buzz  Bass and sub bass frequencies are absorbed by the metal panels in the vehicle and vibrate. If you can eliminate the absorption/vibration, you will gain db's. It all depends on what type of sound deadener you use. I always use Dynamat Xtreme in the trunk where my subs are and in the doors where my mids are. It isn't cheap but well worth the expense. I would say to do your trunk and doors in an average car would probably cost you "around" $300. It doesn't weigh that much, maybe adds 10lbs to your car (trunk/doors). |
let me correct you on a few things.
it doesnt matter what kind of sound deadening you use. There are only a few types. All the ones that look the same, work the same. dynamat Xtreme is good but too expensive for what it is. You can get a much cheaper alternative that will work just as well. What you need to look for is thickness of the sound deadening material.
if you eliminate absorption/vibration you can (not will) gain db's. You can also loose alot more db's than you can gain. It all depends on how and where you apply it. IF your goal is to gain spl inside of the car by using sound deadening it will require a long period of trial and error. Blindly just applying it everywhere wont gain you anything, it will probably loose more than it will gain. If you dont know what you are doing, or dont know someone who knows what they are doing, I would not try to use sound deadening to gain spl. You will probably waste time/money and gain nothing.
if your main goal is to stop rattles on your car, then you can go ahead and blindly apply the stuff anywhere you want. Just remember, 80% of the rattles you hear outside of the car are the things like your license plate, lights, bumpers, exhaust pipe, gas tank, etc.......basically the things that are attached to the exterior of the vehicle. So makesure you have a plan of action before you begin applying the material.
I use B-Quiet, it's made in Canada and can be had on ebay for a really good deal. B-Quiet Extreme is thicker than Dynamat Xtreme and is nearly half the price.
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