Kicker 08ZX5001 ZX-Series 500-Watt Class D Mono Subwoofer Amplifier 250 watts RMS x 1 at 4 ohms stable 500 watts RMS x 1 at 2 ohms stable Mono Class D Amplifier Variable Bass Boost: 0 Db- 18 Db At 40 Hz Variable Low-Pass Filter: 50Hz-200Hz At 24 Db Per Octave