Audio classification Home audio: low sound pressure level, and can accommodate a small number of listeners. Car audio: low sound pressure level, fixed space, fixed listener position, and small number of listeners. Professional audio: high sound pressure level, different usage requirements, uncertain installation location, uncertain quantity, large changes in playback content, and a large number

Car speakers are divided into air speakers and electric speakers according to the power of sound. Air speakers Air speakers are mostly used on large and medium-sized trucks and large buses equipped with air brakes. The volume of air speakers is high and it is forbidden to use them in urban areas. Therefore, whether the