Rockford Fosgate Power T500-1bd Mono subwoofer amplifier 500 watts x 1 at 1 ohm Mono subwoofer amplifier Features 250 watts RMS x 1 at 4 ohms (400 watts RMS x 1 at 2 ohms) Dynamic Thermal Management cooling system Differential Input circuitry eliminates hum Variable low-pass filter (35-250 Hz, 24 dB/octave)