JD1000/1D - JL Audio Monoblock 1000W RMS 2000W Max Class D Amplifier Product highlights: mono subwoofer amplifier 600 watts RMS x 1 at 4 ohms 1000 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)