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My driver side door audio woofer was rattling and making that farting sound like a split diaphragm. As it turned out, the 5.25" speaker was fine. Sometime in the past an idiot had drilled a couple of 1/2" drain holes in the bottom edge of the door. One of those holes was into the speaker's resonance box that extends along the bottom edge of the door. As a result, back-pressure air from the speaker was exiting the hole and causing the sheet metal of the door to vibrate. Stuck some acoustic damping tape over the hole and along the bottom side of the plastic resonance chamber. Problem solved. Sounds great.
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2004 Boxster S
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Earth Tour
Helios 1
Threaded Mode
