Rockford Fosgate T400X4ad

4-Channel Class-AD Constant Power Amplifier 400W RMS: Power Rating: 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 Filter (12dB/Octave): 50Hz - 250Hz C.L.E.A.N Set-up Top Mounted Controls 2/4 Channel Input Switch Dual Fan Real Time Thermal Sensing Dual Extruded Heat Sinks Differential Inputs w/ High Level Auto Turn-On Remote-Out when using High Level Inputs Dimensions: 1.6" (41mm) H x 4.3" (108mm) W x 8.3" (211mm) D 1-Year Dynamic Autosound Warranty