Bazooka BTA6100 BT Series 6-Inch 100-Watt Amplified Tube Subwoofer for $139.00

As all-in-one solutions go, you simply can't beat the A100 Amplified Bass Tubes by Bazooka. Designed to be a simple-to-install yet effective upgrade to your car's existing mobile audio system, the A100 Bass Tubes feature a 100-watt, 2-channel amplifier built right in, coupled to a dual voice coil woofer. Since the amplifier has a built-in crossover to remove the high frequencies that the woofer cannot play from the signal, you get exactly what you need in the A100--crisp, clean bass and nothing more.