Make these Infinity Reference subwoofers part of your sound system's mix, and you'll get terrific low-note impact at an incredible price. These subwoofers incorporate a large 70-ounce magnet for excellent power handling. The innovative deep-draw I-beam basket eliminates sound-robbing resonances, and accommodates the extra-large motor structure for increased bass output. The Reference 1230w 12" component subwoofer handles up to 300 watts RMS, and is designed for use in sealed or ported boxes. You'll enjoy deep, full-bodied bass, thanks to its durable polypropylene cone, high-roll rubber surround, and structure-reinforcing inverted dustcap. Details: 12" 4-ohm subwoofer polypropylene cone with rubber surround deep-draw I-beam basket 70-ounce magnet structure recommended power range: 50-300 watts RMS (1,200 watts peak power) frequency response: 23-400 Hz sensitivity: 90 dB top mount depth: 6-1/4" sealed box volume: 1.25 cu. ft. ported box volume: 2.00 cu. ft. £95