Road noise is the unpleasant sound caused by vibrations and wind that occurs while driving, which is transmitted into the interior of the car and eventually becomes unpleasant noise. Even though it is called noise, it is just sound. If it's a sound, there's always something inside the car that makes that sound. The sound from outside the car does not directly enter the car, but always passes through something, which is why most cars have a hollow quarter area, and since it is directly connected to the tire house, the vibrations are even greater. is. We deaden this area from inside the car, and in order to reduce air reverberations, we use cotton, which is also used in woofer boxes, to be thoroughly deadened before inserting it into the cavity.