Host: Car audio source. The host includes a RADIO host with only broadcast reception function, a RADIO plus MP3 host, a CD host, an MP3 plus CD case, a CD plus navigation host, a CD/DVD/in car MP5 host, a DVD player, etc.

Speaker: A sound generating unit in a car audio system that converts electrical energy into sound waves. This includes high pitched, mid pitched, low pitched, and subwoofer speakers.

Power amplifier: Power amplifier refers to a power amplifier. Commonly known as a "loudspeaker", it is the most basic equipment in a sound system. Its task is to amplify weak electrical signals from a signal source (in professional sound systems, from a mixing station) to drive the speaker to produce sound.

Famous brands: As a high-end automotive brand, automotive companies generally choose several well-known suppliers to customize their audio systems. For example, Bose and Harman from the United States, Siemens VDO from Germany, Dynaudio from Denmark, etc.