Most likely, if you have come this far, then you already know the basics about installing a speaker systems in your car. You may have already bought subwoofer. Some come with one installed, others you may need to buy one separately.
* '''High frequencies''' need a crossover or control center that can regulate the power sent to your various components so that nothing gets shorted out.
* '''Easy installation'''. Get a car wiring kit that comes complete with all the stuff you need for a painless installation process. You will get fuses and wires that you can get for the specific power amp you buy.