Energy S12.3 Subwoofer Bass Reflex with Downward Firing Ports System Type 300-Watts Continuous, 1200-Watts Dynamic Peak Amplifier Power Output 1.61 Peak-to-Peak Maximum Driver Excursion 50Hz-110Hz at8dB/Octave Variable Low Pass Filter 12 Polypropylene Ceramic/Glass/MICA Deposit Hybrid with Ribbed Elliptical Surround Woofer