Pioneer GM-D8500M Class-D Mono Amplifier with 1200 Watts Max. Power Mono subwoofer amplifier with 1200-watt max power capability Delivers continuous 300 watts x 1 at 4 ohms, 600 watts x 1 at 2 ohms Variable low-pass filter crossover (40~240Hz, at -12 dB per octave) Speaker-level inputs for connecting to most source units 50Hz bass boost with remote level control (0~12dB)