Rockford Fosgate Punch P400-1 400-Watt Mono Amplifier Mono amplifier with 400W x 1 @ 2-Ohms RMS power rating (300W x 1 @ 4-Ohms RMS) Perfect for use as a dedicated subwoofer or center channel amplifier Variable high- and low-pass crossovers (50-500Hz at 12dB/octave) MOSFET output stage and power supply Punch EQ2 bass and treble boosts