The AcousticPerformance™ AP-212sw is a premium, direct radiating dual 12" subwoofer designed for use in portable and installed sound applications. It provides exceptional punch while maintaining ample extension so the musically important fundamentals are solidly and accurately reproduced. Plus, this subwoofer is an ideal companion for the AP-4122m and AP5122m full range models, providing added low frequency extension and musical accuracy to the AcousticPerformance portfolio.