Klipsch RSW-10 Powered Subwoofer Subwoofer system using one 10 (25.4cm) rear-firing, aluminum cone woofer and one 10 (25.4cm) front-firing, aluminum cone passive radiator Bass reflex passive radiator enclosure FTC Rated Power - 385 watts continuous, 40-110Hz &lt;1% THD / Dynamic Power* - 1150 watts @ &lt;1% THD Frequency Response Range - 29 Hz - 120Hz Continuously variable from 40-120Hz