MTX RFL300D 600W Peak Class D Mono Amplifier RFL Series Monoblock Class D Car Amplifier , RMS Power Rating , 4 ohms: 200 watts x 1 chan, 2 ohms: 300 watts x 1 chan. Max power output: 600 watts x 1 chan. Patented adaptive class D technology, Wired remote bass level control included , LED power (green) and protect (red) indicators , Bass Boost (0 to +12 dB bass boost at 40 Hz) 3-Way System Protection circuitry (thermal, overload, and speaker short protection) Input sensitivity: Level: 250mV-5V ( Variable low-pass filter (40-200 Hz, 24 dB/octave) Subsonic filter (12 dB at 20-50 Hz) Frequency response: 20-200 Hz