Definitive Technology SuperCube II 120v Subwoofer (Single, Black) (Discontinued by Manufacturer) Single, supercube amplified subwoofer speaker Equipped with one 8-inch long-throw polymer subwoofer coupled to two 8-inch pressure-driven infrasonic bass radiators Built-in 1250 watts digitally-coupled Class D amplifier Frequency response: 14Hz - 200Hz High quality finish in piano gloss black