Polk Audio PA D2000.2 (PAD2000.2) 500W RMS PA D Series Class-D 2-channel Car Amplifier 125 watts RMS x 2 at 4 ohms (250 watts RMS x 2 at 2 ohms) 500 watts RMS x 1 in bridged mode (4-ohm stable in bridged mode) Compact Size: 9"W x 1-13/16"H x 6-3/4"D Nickel-plated RCA level inputs and Nickel-plated screw terminals Variable high-pass filter: 20 - 400 Hz (x10 Capable), 12 dB/octave Variable low-pass filter: 50 - 500 Hz (x10 Capable), 12 dB/octave