Pioneer PRS-D4200F - PRS Series 4-Channel Full-Range FD Car Amplifier 75W RMS X 4 At 4 Ohms (150 Watts RMS X 4 At 2 Ohms) 300W RMS X 2 In Bridged Mode (4-ohm Stable In Bridged Mode) Variable High & Low-pass Filters (40-500 Hz, 12 DB Per Octave) Dimensions: (WHD) 11-7/8 X 2-1/4 X 9-11/16 In.