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Car door speaker insulation.
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Take it a step further by adding high density closed cell foam a denser material that will improve car door insulation inside the door cavity while reducing some low frequency sounds like road noise and speaker distortion.
Besides giving you an insulated door closed cell foam is the best material to use as a decoupler to ensure plastic parts like those in your door panels won t make rattling noises when you turn up the music.
The first thing you ll need to do before collecting your tools is actually inspecting the car doors if you can t dig up your car manual at least look up how other people pulled the doors apart on the same or similar models that will be a pretty important step throughout this whole process since i can t go into detail on every individual car make.
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