Car audioMost people using the term car audio to describe the sound system in an automobile, though the term also refers more broadly to the field of mobile entertainment. A stock car audio system refers to exactly what was specified by the manufacturer when the car was built. A custom car audio installation could mean anything from the upgrade of the radio to a full-blown customisation of a car based around delivering exceptional sound quality or volume from audio equipment.The most common and familiar piece of audio equipment is the radio/tape player/CD player which is generically described as a headunit. It is also the most likely component to be upgraded with an after market item. Many luxury cars on the market in 2002 will include at least a CD player source and a moderately sized subwoofer with enough amplification to more than please most people. Speakers are generally located in doors and rear parcel shelves of sedan in modern cars. Before stereo radio was introduced, the most common speaker location was in the middle of the dashboard pointing through perforations towards the front windshield. A recent development in mobile audio has been the addition of MP3 players incorporated into headunits. Other components that make up high end car audio installations may include:
At first, speakers from the home audio and professional markets were simply installed into vehicles, however, they were not well suited to the extremes of temperature and vibration which are a normal part of the environment of an automobile. Modified drivers were developed to cope with these factors. Subwoofers were introduced in ___. Believing that "louder is better", there were some extremes of installation of multiple over-sized speakers. In 1985, Wayne Harris' famously modified a 1960 Cadillac Hearse featured several 24 inch diameter subwoofers. Today, advances in acoustic technology mean that even two 10s (inches) in a well designed efficient enclosure can produce more than 130 decibels SPL (sound pressure level) within the cabin. Car audio competitions started in the early 1980s in a quest to find the loudest and/or most outrageous installations. Early on, little credence was given to sound quality. In the early 1990s, several organizations, including IASCA, began car audio competitions focusing on sound quality. The two styles - SPL vs. sound quality - have become almost mutually exclusive.
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