Car audio is a term used to describe the sound system
fitted in an automobile
A stock car audio system refers to one that was specified by the manufacturer
when the car was built. A custom car audio installation can involve anything from
the upgrade of the radio to a full-blown customization of a car based around its audio equipment.
Events are held where entrants compete for the loudest or most innovative systems.
The most common and familiar piece of audio equipment is the tapeplayer/CD player/DVD
Player which is generically described as a Head unit, which also can be called a
head deck, after older tape decks. It is also the most likely component to be
upgraded with an after market item. A recent development in head unit technology has been
the addition of CD players with MP3, Ogg, WMA, AAC, and USB, Bluetooth and Wi-Fi support.
Even with the rampant ubiquity of solid state MP3 players, car audio systems
with line-in jacks and other standards are only in their infancy, and that since
tape adaptors are often used with tape players, people are now viewing car radios
with built-in CD players as "misfeatures" of the audio system since people now often
"rip" their CDs onto their computers.
Most modern cars include at least a CD player/CD recorder, and some have the
option for a CD changer, which holds multiple disks either in the head unit itself or
in a separate unit usually located in a trunk or console.
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