Rockford Fosgate PBR400X4D

4-Channel Class-D Amplifier Rockford Fosgate Boosted Rail Technology 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 Response: 20Hz - 20,000Hz High-Pass Filter (12dB/Octave): 60Hz or 80Hz Low-Pass Filter (12dB/Octave): 80Hz C.L.E.A.N Set-up Real Time Ouput and Power Supply Thermal Sensing Extruded Aluminum Heatsink Differential Inputs w/ High Level Auto Turn-On Remote-Out when using High Level Inputs Dimensions: 1.53" (39mm) H x 4.25" (107.9mm) W x 6.75" (171.6mm) D 1-Year Dynamic Autosound Warranty