JBL, High Performance Mono Subwoofer Car Amplifier CLUB SERIES. High Performance Mono-Block Subwoofer AmplifierSpecifications: 600 watts RMS x 1 at 4 ohms (1000 watts RMS x 1 at 2 ohms): Yes Class D amp technology: Yes frequency response: 10 320 Hz variable low pass filter (32 320 Hz, 12 dB octave): Yes variable bass boost (0 12dB at 45Hz): Yes phase switch (0, 180 degrees): Yes wired remote level control included: Yes preamp inputs and outputs: Yes speaker level inputs (speaker wire to RCA adapters included): Yes 4 gauge power and ground leads recommended