Originally posted by Fusion
I thought that was to stop rattles from the car's bodywork due to bass, not quieten the music for others
Doing that in it's self makes a differnce, Bass tranfers so well from inside cars, because of the vibrations of the body work, the bass resinates through the bodywork, and comes out at the saem volume if not louder as it is inside the car.
Sound deadening stops the vibration thus greatly reducing the resination of the bass on the cars body, which reduces the noise heard outside the car.
That is what i always understood sound deadening to do, stops vibrations, which in ALL cases, Vibrations are what generate sound, less vibrations = less noise.