Rockford Fosgate PM400X4 Punch Marine/Powersports 4-Channel AmplifierThe PM400X4 is perfect for 4 way front stage rear fill or 3 way front stage subwoofer systems. Simply drop a pair of component speakers on the front channels and subs on the rear and BOOM you got "The PUNCH." With its flexible design, the PM400X4 is an excellent amplifier choice for virtually any vehicle. High level input capable with Auto Turn On circuit Features C. L. E. A. N. Set up 12dB octave Butterworth crossover On board Punch EQ with +18dB