In order to qualify as a sound system, it must include at least the following points, which is true of any sound system, and car audio is no exception. 1. Software and media; 2. Sound source; 3. Front level signal control; 4. Power amplification mechanism; 5. Speaker; 6. Transmission mechanism. Although audio equipment is only an auxiliary device for cars, it has no impact on the running performance of the car. But as people's demands for enjoyment become increasingly high, car manufacturers are also paying increasing attention to the sound equipment of cars and using it as one of the criteria for evaluating the comfort of cars.

The car audio system is located in a very complex environment, which is constantly subject to electromagnetic interference from the ignition device of the car engine and various electrical appliances. Especially, all electrical appliances in the car use a battery, which can cause interference to the audio system through power lines and other circuits. The anti-interference technology of the car audio system uses a choke ring to filter the interference of the power line between the power supply and the audio system, and uses a metal shell to seal and shield the spatial radiation interference. An anti-interference integrated circuit is installed specifically in the audio system to reduce external noise interference.