Rockford Fosgate Punch 400 Watt 4-Channel Amplifier The Rockford Fosgate Pbr400X4D is a full range 4 channel amplifier designed for stereo front and rear systems that need little space to work. The Boosted Rail Technology is a high efficient design that generates 400 watts of power. The Boosted Rail Technology has a variable hi-level DC offset turn-on circuit for easy installation into any OEM system. Features: Full Range Class-D Differential inputs with high level auto turn-on feature 8 AWG power/ground connector Remote-Out feature when using high level inputs C.l.e.a.n. input/output clip detection and indicator LEDs Real time output and power supply thermal sensing Extruded aluminum heatsink Selectable Fixed 12dB/Octave Butterworth Crossovers Muted turn on Rockford Fosgate proprietary protection Discrete surface mount technology Compact design for stealth installations Cea-2006 and CE compliant 1 Year Warranty Includes: Punch Amplifier, RCA to 4-pin Molex Input Connector(s), Pwr/Gnd/Rem Connector,16 AWG 4-pin Molex Speaker Connector(s) Power Connector Note: For weather resistant unit, see Tm400X4Ad.