Rockford Fosgate TM400x4ad

400 Watt Class-AD 4-Channel Marine Amplifier Multi-impedance Constant Power Power Rating RMS: 4 Ohm: 100 watts x 4 ch. 2 Ohm: 100 watts x 4 ch. 4 Ohm Bridged: 200 watts x 2 ch. Frequency Response: 20Hz - 20,000Hz High-Pass / Low-Pass (12dB/Octave): 50Hz - 250Hz C.L.E.A.N. Setup Top Mounted Controls 2 / 4 Channel Input Switch Differential inputs with high level auto turn-on feature Marine grade two part epoxy coating on circuit boards Real Time Thermal Sensing Dual Extruded Heat Sinks Dual Fan Cooling Dimensions: 1.6" (41mm) H x 4.3" (108mm) W x 8.3" (211mm) D 1-Year Dynamic Autosound Warranty