Energy S-10.3 800-Watt 10-Inch Subwoofer (Black) (Discontinued by Manufacturer) 10-inch injection-molded woofer with patented ribbed elliptical surround suspension for greater output and lower distortion 800-watt dynamic / 200-watt RMS custom matched amplifier for clean and deep bass down to 21Hz Rigid, low-distortion MDF enclosure with black ash finish and integrated front level control Variable crossover and phase control to blend with any speakers, low-level and speaker level inputs for connection to any receiver, amplifier or TV Front-firing, down-ported design for maximum impact and reduced port turbulence and distortion