Often overlooked is the real improvement in audio quality that can be obtained from paying careful attention to the environment in which the speakers are operating. Eliminating any irritating vibrations and improving the sound proofing does make a massive difference. Do surrounding noises around you irritate you or prevent you from hearing your music, conversations or GPS? Or maybe your audio systems sound quality is escaping? The solution is sound deadening. Sound deadening will keep out unwanted road noise and keep your favourite sounds inside the car.
