The main addition to any car stereo system is the head unit. Most users who add an aftermarket stereo system, or those just wanting more audio options, opt to install a different head unit. Head units are also referred to as a receiver or just CD player. The head unit controls all of your audio functions, including turning on an amplifier, playing compact discs, and adjusting your bass, treble, and other audio controls.

There are many different types and brands of head units. The most popular types of head units are manufactured by Sony, Pioneer, Panasonic, Alpine and Kenwood. There are many new features in today’s head units. It is up to the user to decide which types of functionality they require in their setup. Brand choice and price are the two main factors when it comes to feature availability on head units. Cassette tape players are often skipped for a unit that focuses on playing CD’s only. It addition to playing CD’s, most newer models can also play MP3/WMV music formats, DVD’s, and offer Blue tooth connectivity. Those who do not know about different audio formats, or are not computer savvy may find that MP3/WMV playback is not a necessity, and those who don’t wish to watch movies do not need DVD playback. Some units also have inputs for devices such as Ipod/MP3 players, allowing easy hookup with just one cable. Higher end head units may even come with a remote control, although sometimes it is easier to just adjust the head unit by reaching over and hitting the appropriate buttons.

A main reason for installing a different head unit is because of the ease when it comes to installing other aftermarket audio equipment such as subwoofers, CD changers and amplifiers. Most aftermarket head units offer amp outputs and increased wattage per channel. Wiring harnesses can be purchased so the user doesn’t have to cut the original factory wiring harness when installing a different head unit. The remote turn on wire for amplifiers can be installed easily as well with a new head unit. With these features on aftermarket head units, installation is much simpler and doesn’t require as much cutting into factory speaker wiring.

One of the most important steps when choosing a head unit is who is going to install it, and finding the right installation kit. It most instances, an aftermarket head unit is never going to look as flush and professional as a factory unit (OEM). Since most aftermarket head units are not the same size as a factory unit, they will in most cases have a “filler” piece that goes on the top or bottom of the head unit such as a blank plate or a pocket for holding change. Keep in mind to do research of others with your type of vehicle and experiences they have had. An aftermarket head unit may have a negative affect on some of your previous audio functions because they may have been wired into the factory unit. Some functions that may become disabled are steering wheel audio controls, control of factory subwoofer systems, and even some keyless entry systems.

Always ask an audio professional if they foresee any installation problems. If you do not feel comfortable performing basic wiring or removing pieces of your dashboard without doing damage, you should seek the help of a professional. Some establishments may install a head unit no charge. There are many factors that go into purchasing a new head unit. With your audio plan in mind and features of choice and brand decided you can go from there.