Rockford Fosgate P400-4 400 Watt 4-Channel Amplifier Four-channel amplifier delivers 50W x 4 @ 4-Ohms, 100W x 4 @ 2-Ohms, 200W x 2 @ 4-Ohms bridged RMS Variable front and rear high- and low-pass crossovers (50-500Hz at 12dB/octave) Punch Bass adjustable bass (0dB to +18dB @ 45Hz) and treble (0dB to +12dB @ 12kHz) level control Perfect for 4-way front-stage/rear-fill or 3-way front-stage/subwoofer systems MOSFET output stage and power supply