Rockford Fosgate T500-1bdCP Power 500 Watt Class-bd Constant Power Amplifier Constant Power bd amplifiers optimize power at 2 and 1 ohm DTM (Dynamic Thermal Management) P.O.W.E.R. (Power Output Without Excessive Regulation) 24dB variable crossover 500x1 @ 1ohm Mono amplifier delivers 300W x 1 @ 4-Ohms, 500W x 1 @ 2-Ohms, 500W x 1 @ 1-Ohm (RMS) Class-bd amplifier with MOSFET output stage and power supply Variable low-pass filter with range of 35-250 Hz (24 dB/octave slope) Variable bass boost (0dB to +18dB @ 45Hz) and infrasonic filter (-3dB @ 28Hz 12dB/Octave) Audiophile grade speaker connections and RCA pass-thru