The in dash control center of a car audio system, usually consisting of an internal low powered amp, AM/FM receiver, and either a tape or CD player (or both).

The usable part of a component that is mounted in the dashboard is commonly referred to as a head unit. It controls the components, either internally or remotely installed, such as a changer mounted in the glove compartment or trunk.

A factory or aftermarket car radio, especially with CD or cassette.

A head unit is a component of a stereo system either in a vehicle or home cinema 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.