Bazooka BT Series 8 Inch 100w Amplified Tube SubwooferThe new amplified Bazooka subwoofer features the legendary patented Bass Tubes enclosure design which provides maximum output. Completely self contained with built in Mosfet Amplifier and an 8 inch dual voice coil subwoofer, this is the ultimate bass solution, and fits in places most subs can't. 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; crisp,