Infinity Reference 1220de Dual 12-Inch Preloaded Enclosure with Slipstream Port (Silver/Black) Dual 12-inch ported enclosure preloaded with two 12-inch Reference subwoofers 1800 peak power handling; 2 or 8 ohm impedance; 30Hz-300Hz frequency response Infinity's Slipstream port for more bass output with greatly reduced port noise and distortion High-efficiency polypropylene woofer cones with large-roll rubber surrounds ensure efficient, clean bass One-year warranty