A subwoofer meant for a car stereo can often give you better sound quality on your home theater system. The problem is that this subwoofer requires an amplifier that runs on 12-volt power, like from a car battery. The subwoofer and amplifier would fry if either was plugged into a home power socket. So you need to plug in the subwoofer’s amplifier separately with a power inverter and then hook up that amplifier to the main amplifier on your surround system.

How to Install a Car Subwoofer to a Home Theater - 31