The Infinity Reference 1220de is a Dual 12-inch Preloaded Enclosure with a Slipstream Port. The Slipstream port delivers higher output potential than conventional ports and greatly reduces distortion. This gives you louder, cleaner bass. The power handling on this enclosure is 600 Watts RMS with peaks of 1800 Watts. Infinity Systems is a leader in loudspeaker design for both car and home speaker systems and is part of Harman International.