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Old 10-06-2012, 10:30 PM   #9
330iPilot
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Join Date: Mar 2005
Location: Dallas, TX
Posts: 577
My Ride: Titanium Silver 330i
The problem is the transmission of the sound by vibrating the ceiling which in turn virbrates the floor turning it into a giant speaker. You have to reduce the vibrating by either adding mass, decoupling, or a combination of both.
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