What does sound proofing do? Why buy sound proofing?
The job of sound proofing is to set up an acoustic barrier that helps keep road noise out and your car stereo's sound in. This will make your stereo more efficient and help the acoustics of your car's interior by reducing echoes, drones and rattles. Just like thermal insulation in your house, sound proofing usually comes in sheets or in spray on form and is installed on the large surfaces of your car (under carpets, trunk floors etc.) that would normally let sound through and also echo, rattle and reverberate sound waves. When installed sound proofing helps to transform the cabin of your car into a pleasant and quiet place to drive, until you turn on the stereo and then you receive the full sound potential from your car audio system.