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Audio Systems

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 radio/tape player/CD player/DVD Player which is generically described as a Head unit, many aftermarket units are available and different options depending on your needs such as iPod control, Built-In Bluetooth, Audio Quality etc.

Car speakers are generally located in doors and rear parcel shelves of a sedan in modern cars.

High-end audio systems include Component Speakers that consist of a matched tweeter (small, high frequency), midrange (medium, medium frequency) and woofer (large, low frequency) set. These component pairs are available in two speaker and three speaker combinations, and include an audio crossover which limits the frequency range that each component speaker must handle. This allows each cone to produce its optimal frequency for maximum sound quality and volume.

In addition subwoofer(s) are provided for bass and sub bass (ultra low frequency), which is felt more than heard depending on the sub frequency, the lower the frequency the less the human ear picks it up, however the chance of "feeling" the vibration becomes greater. Sub bass is omni-directional, meaning that the human ear cannot distinguish where the sound is coming from. Humans cannot hear subsonic frequencies (below the frequency of 20hz), we are however able to feel it (eg. An air rush when closing a door cannot be heard, it can be felt however). Crossover systems can be active or passive crossover networks. Active electronic crossovers divide the signals before they are sent to the amplifiers giving a dedicated amplifier channel to each individual driver in the component system. Passive crossover networks divide the signal after amplification, making it possible to run multiple speaker component sets using just one channel. 

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