Product highlights: bass-reflex (ported) enclosure with down-firing Power Port® for clear, accurate bass 12" front-firing polypropylene woofer 200-watt RMS (400-watt peak) Class D amplifier frequency response: 28-120 Hz (-3dB) RCA line level/LFE (low frequency effects) input variable low-pass crossover control phase switch to acoustically match the subwoofer's output to your main speakers automatically powers off when it no longer receives signal from the receiver 17-3/16"W x 18-1