Preparing the tools and materials.
Car door speaker insulation.
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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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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.
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.