Rockford Fosgate PM400X4

4-Channel Class-AB Marine Amplifier 400W RMS Power Rating: 4 Ohm: 50 watts x 4 ch. 2 Ohm: 100 watts x 4 ch. 4 Ohm Bridged: 200 watts x 2 ch. Frequency: 20Hz - 20,000Hz High-Pass Filter (12dB/Octave): 50Hz - 250Hz Low-Pass Filter (12dB/Octave): 50Hz - 250Hz Punch EQ: +18dB boost @ 45Hz Balanced Differential Inputs High level input capable w/ Auto Turn-On circuit Muted Turn on C.L.E.A.N Setup Cast Aluminum Heatsink Dynamic Thermal Management Short circuit / Over current protection Marine Grade Stainless Steel Hardware Dimensions: 7.8" (197mm) H x 11" (280mm) W x 2.4" (60.5mm) D 1-Year Dynamic Autosound Warranty