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Eliminating resonance from your door skin flexing, back waves from speaker echoing and cancelling front waves, door card rattling, etc. It is the absolute best bang for the buck sound improvement you can make for your car.
Check out a youtube video on the subject by Richard Vedvick, and excellent youtube video by car audio fabrication. Mark is an excellent teacher and can explain things simply and concisely. On doityourselfmobileaudio.com (DIYMA), there's an all encompassing thread (sounddeadenershowdown). Hope this helps!
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Way too many mods to list, and just getting started...
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