mono subwoofer amplifier 300 watts RMS x 1 at 4 ohms (500 watts RMS x 1 at 2 ohms) Class D amplifier design MOSFET switching power supply frequency response: 10 Hz - 150 Hz variable low-pass filter (50-200 Hz, 12 dB/octave) variable bass boost (0-12 dB at 45 Hz) optional wired remote level control preamp inputs and outputs speaker-level inputs 4-gauge power and ground leads and a 50-amp fuse recommended — wiring and hardware not included with amplifier no onboard fuses — when installing multiple amps in a system, an additional 50-amp in-line fuse between the distribution block and the amplifier is recommended