Stereo System

Just about all cars come with a stereo system, unless it has been taken out. There are multiple components to the stereo system, and things you can add to your stereo system to get even better quality. The possibilities are endless and can be costly, but it's all worth it.
Head Unit. This is the part of the radio that you think of when you are thinking about a car radio. It is where you put your CD's in or change the radio station. Behind this there is a harness of wires that go all over the place. Some to the power, some to the antennae and then for the speakers of course, and others else where that doesn't really need to be covered.
Types of speakers. You have Tweeters, Mid Ranges, and Subwoofers. Tweeters and midranges are stock in just about every car, subwoofers are usually aftermarket installed, but the mid ranges will support a small amount of bass. Tweeters are all about the high pitched noises. Sound is measured in Hz, and tweeters cover the higher numbered Hz. They are usually small and not very noticeable, unless of course you install larger ones. Mid Ranges are what you think of when you think about the speakers in your car. These are the speakers in the doors and panels next to back seats. These speakers are a combination of a subwoofer and a tweeter. They give you middle level range hz which some bass can be heard from alone with treble (vocals). Then lastly Subwoofers. These are usually a lot larger than your mid ranges and most cars do not come with just a subwoofer to increase the bass. They are installed by the owner or the owner has them installed by a professional. And when having them installed, because they require so much power, you have to wire it through the car battery and through an amplifier.