Without an car amplifier, the car subwoofer will simply not perform to its best ability. The factory car stereo doesn't have enough power to make an car subwoofer function. Car subwoofers have bigger voice coils than traditional car speakers, so they tend to require an huge amount of power to get them moving. You need to find an car amplifier that matches the rms wattage rating of your car subwoofer. You also need an suitable car amp that support the lowest ohm configuration your car subwoofer can handle. For example if your car subwoofer is an 2ohm magnet, you need an amplifier that can be wired down to 2ohms. If you wire an 1ohm speaker to an 4ohm only car amplifier, you will damage the car amp or it will go into protect mode.
Once you have obtained your car amplifier, you need to obtain an relevant wiring kit. You can get an brand new car amp wiring kit from ebay. This will contains all your cables and parts. The red wire will need to be connected to the 12 constant positive feed from the car battery. The ground wire will be the shorter black cable that goes to an bolt in the trunk area. The blue remote wire will connect to an switched 12 volt source, or if you have an aftermarket headunit directly to the blue wire behind the car radio. The RCA cables will connect from the preouts on the back of the headunit into the inputs on the car amplifier. If you are using an factory headunit, you will need to wire an RCA converter, make sure you use an quality one as cheap ones are prone to make buzzing sounds and engine interference.
Depending on your car amplifier, you can also bridge the terminals on your car amplifier for more power, if it is an two channel stereo amplifier. To bridge an car amplifier is easy, get some speaker wire and attach to positive on channel one, on channel two attach the other end of the speaker wire to negative. Then insert the other end of the speaker wire into the terminal posts on the car subwoofer enclosure matching the red and black colours. There are two common places to mount your car amplifier. The most common being directly on the back of the subwoofer box, this is an great idea if you are after an simple installation. You can also use an drill to mount it directly onto the back seat, this is more of an job to do but the results are certainly worth it.
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