Stock car stereo systems usually do not pack much punch. To really highlight the bass of your car stereo, you need a setup capable of properly reproducing low frequency notes. Adding a subwoofer and amplifier to your existing stereo is a great way to improve the bottom-end output of your system and is one of the most common upgrades performed on a car’s audio gear. Warnings Writer Bio

How to Wire an Amp   Subwoofers Into a Stock Stereo - 12