Forget about "the home of the $1 install" because this is a complete how to guide for car audio installation. Installing a car audio system is actually much easier than most people think. It can also be rather enjoyable for the stereo enthusiast. Most any car audio product that is purchased will come with easy to follow directions to help with the installation process. For the novice in car audio there are two basic elements to consider when upgrading a car audio system. The first element is the receiver or head unit, more commonly referred to as the CD player or radio. The second is the speakers which will include front and rear. Now follow along for a more thorough explanation of the two elements just mentioned.
The receiver is essentially the brain of a car audio system. That's why it makes sense to call it the head unit. It's the head unit's job to read CD's and pick up radio frequencies and then send that information out to the speakers. Receivers vary in price range from under a $100 to well over $1200 depending on features and quality. If there is extra money in the budget don't skimp on a good receiver, remember it's the brain so get a smart one.
Regardless of how much it costs the installation of a receiver is going to be basically the same for all of them. There are generally three wires that are universally color coded on the receiver. There will be one black wire which is the ground wire; this is the same as the negative cable on a car battery. Then there is also a yellow wire which is .
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for the receiver memory; it hooks directly to the positive terminal on the battery. This keeps the clock set and stations programmed into the receiver. Lastly there is a red wire which is the positive ignition wire. This wire is connected to a power source that is turned on and off by the ignition; that's why the radio comes on when the car is started. There will be several other wires for connecting the speaker and various other things depending on how fancy the receiver is, but those three are standard.