The xplod xm-ds1300p5 monaural amplifier from sony was specifically designed to provide your subwoofers with the kick they need. The mosfet power system keeps you rockin regardless of fluctuation in voltage from your power source. The monoblock design provides the clearest bass possible and delivers even distribution of power to your subs. Features: 200 watts rms x 1 at 4 ohms, 400 watts rms x 1 at 2 ohms, class d design , variable low-pass crossover (50-300 hz at 12 db per octave) , variable bass boost (0-10 db at 40 hz) , subsonic filter (for cleaner performance) , speaker- and preamp-level inputs , preamp outputs , remote bass control , gold-plated connectors, requires 4-gauge power/ground leads (wiring and hardware not included with amplifier) , 11-5/8w x 2-1/4h x 11-1/2d