sealed enclosure with 12" subwoofer polypropylene cone with rubber surround stamped steel frame 5/8" medium-density fiberboard construction covered with carpet 4-ohm impedance handles up to 300 watts RMS (1200 watts peak power) frequency response: 35-200 Hz sensitivity: 91 dB dimensions: 17-5/16"W x 14-1/2"H x 6-5/16"D1 x 10-3/16"D2