Kenwood KSC-SW11 150W Low-Profile Amplified Car Subwoofer Enclosure+Amp Kit New Kenwood KSC SW11 8 1/4" x 5 1/8" 150 Watt Powered Car Subwoofer Enclosure Maximum output power: 150W Size: "8 1/4 x"5 1/8" Diaphragm: Aluminum Surround: Urethane