Head unit
Encyclopedia : H : HE : HEA : Head unit
A head unit is a component of a stereo system either in a vehicle or home theater system used to tie together and provide a unified interface system for the various components of a system, ranging from audio players such as a remote-mounted CD changer, to the speakers or audio amplifiers. An antiquated name for a head unit is a receiver.
The most standard sizes in vehicles are Single DIN (178x53mm) in Europe, South America and Australasia and Double DIN (178x106mm) in Japan and North America.
Connecting to the electrical system
ISO connectors are most typical for head units. These connectors contains pins for power-supply, on/off (typically controlled by ignition key), speakers and optionally motorised antenna.
ISO Connections (viewed from cable side of connector)
| Right Rear (1) | Right Front (1) | Left Front (1) | Left Rear (1) |
| Right Rear (2) | Right Front (2) | Left Front (2) | Left Rear (2) |
| ** | N/C | Auto aerial
|
| N/C
| Illumination | Earth |
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