27007. No driver of a vehicle shall operate, or permit the operation of, any sound amplification system which can be heard outside the vehicle from 50 or more feet when the vehicle is being operated upon a highway, unless that system is being operated to request assistance or warn ofRead More →

California: Illegal to use a sound amplification system which can be heard 50 or more feet away from the car while on the highway; … Georgia: Illegal to amplify sound from within the car so that it’s plainly audible at a distance of 100 feet or more from the vehicle.Read More →