Rockford Fosgate Punch 400-Watt Stereo Amplifier 12dB/octave Butterworth crossover MOSFET power supply MOSFET output stage Stereo amplifier delivers 100W x 2 @ 4-Ohms, 200W x 2 @ 2-Ohms, 400W x 1 @ 4-Ohms bridged mono Variable high- and low-pass crossovers (50-500Hz at 12dB/octave) MOSFET output stage and power supply Punch EQ2 bass and treble boosts Low-level RCA pass-through for system building