Energy ESW-C10 10-Inch 400 Watt Subwoofer (Black) 10-Inch Injection-molded woofer with patented Ribbed Elliptical surround suspension for greater output & lower distortion 400 watt Dynamic / 150 watt RMS custom matched amplifier for clean and deep bass down to 32hz Rigid, low-distortion MDF enclosure with Black Ash Finish and Black High Gloss trim Variable Crossover and Phase Control to blend with any speakers, low-level & speaker level inputs for connection to any receiver , amplifier or TV Front-firing, down-ported design for maximum impact and reduced port turbulence & distortion