Atlantic Technology SB-900-BLK 8" Front-Firing Powered Subwoofer, 125-Watt (Single, Black) 8-inch powered subwoofer with 125-watt amplifier Special proprietary distortion-detection circuitry prevents distortion even at high volumes Auto-on signal sensing and phase control Adjustable crossover, with bypass setting for electronics that have built-in bass management Ideal for sound bars and compact home theater systems