Rockford Fosgate Punch PBR300X1 300 Watt Monoblock Amplifier The Rockford PBR400X4D is a

The Rockford PBR400X4D is a full-range 4-channel car audio amplifier designed for stereo front/rear systems that requires little space

Sensitivity: 85 dB

RMS Power @ 1 Ohm

The REF407F 4" 2-way car speakers follow that Infinity heritage by offering the killer combo of high efficiency and superb sound

Rockford Fosgate Punch PBR300X1 300 Watt Monoblock Amplifier The Rockford PBR400X4D is aThe PBR300X1 is a mono car audio amplifier designed for a subwoofer system that requires little space. The BRT (Boosted Rail Technology) is an ultra efficient design that doesn't even use a switching power supply to generate its 300 Watts of power! The BRT also has a variable hi level DC offset turn on circuit for easy installation into any OEM system. See our Element Ready amplifiers designed specifically for Motorsports and Motorcycle applications.