Rockford Fosgate Punch 300 Watt 2-Channel Amplifier The Punch Pbr300X2 uses our patented BRT (Boosted Rail Technology) for an ultra efficient design that does not use a switching power supply to generate its rated power. This allows the chassis design to be much smaller than traditional sized amplifiers. The BRT also has a variable hi-level DC offset turn-on circuit for easy installation into any OEM system. It is great for smaller stealth installations, as well as for motorcycles and recreational vehicles. Features: Variable 4-6 volt hi level DC offset voltage input turn-on control Ultra compact chassis High level inputs Mosfet output stage 12dB/octave Butterworth crossover 1 Year Warranty