Infinity Reference 1220se Single 12-Inch Preloaded Enclosure with Slipstream Port (Silver/Black) Single 12-inch ported enclosure preloaded with 12-inch Reference subwoofer 1200 peak power handling; 2 ohm impedance; 33Hz-300Hz frequency response Infinity's Slipstream port for more bass output with greatly reduced port noise and distortion High-efficiency polypropylene woofer cone with large-roll rubber surrounds ensure efficient, clean bass One-year warranty