The Punch P700-1bd mono amplifier is specifically designed for medium to high-powered subwoofer applications. The variable crossover and built-in Punch EQ allow precision tuning of Bass, and the infrasonic filter keeps subsonic frequencies from damaging subwoofers. The Pass-Thru RCA jacks provide flexibility as your system grows and keeps Y-adapters to a minimum. This amplifier combines the efficiency of Class-D with the power of Class B and is perfect for running any subwoofer system.