Energy ESW-C8 8-Inch Subwoofer (Black) 8-inch injection-molded woofer with patented Ribbed Elliptical Surround suspension for greater output and lower distortion 240-watt custom matched amplifier for clean and deep bass down to 36hz Rigid, low-distortion MDF enclosure with Black Ash Finish and Black High Gloss trim Variable crossover and phase control to blend with any speakers Front-firing, down-ported design for maximum impact and reduced port turbulence and distortion