JD500/1mono subwoofer amplifier 250 watts RMS x 1 at 4 ohms 500 watts RMS x 1 at 2 ohms Class D amp design with NexD switching technology frequency response: 7 500 Hz variable low pass filter (50 500 Hz, 12 dB octave) variable bass boost (0 12 dB at 45 Hz) preamp inputs and outputs differential balanced inputs prevent noise signal sensing turn on with speaker level inputs wiring, fuse, and hardware not included with amplifier 4 gauge power and ground leads