Rockford P1000X5 Punch 5-Channel Amplifier 1000 Watt, 5-Channel High level input capable with Auto Turn-On circuit Frequency Response: Front/Rear: 20Hz - 20kHz +/-3dB, Sub: 20Hz - 500Hz +/-3dB 12dB/octave Butterworth crossover On-board Punch EQ with +18dB boost @ 45Hz.