Klipsch Reference Series RW-10d 10'' Powered Subwoofer - Black Ash Frequency Response 35-120Hz +/-3dB Amplifier Power FTC Rated Power - 200 watts continuous @ &lt;2% THD / Dynamic Power - 420 watts Maximum Acoustic Output 110dB @ 30Hz 1/8 space, 1m Drive Components 10 (25.4cm) Fiber-composite cone, front-firing woofer Amplifier BASH digital hybrid