Circuit quality quite a crossover frequencies between 250Hz 25Hz circuit board on the opamp 4558 setting can be made. Proteus ares of project drawings are printed circuit boards. Subwoofer Crossover @ ahmedyerli of circuit and PCB design About 25Hz... Electronics Projects, Subwoofer Filter 25Hz 250Hz Bass Crossover Circuit "audio control circuits, " Date 2019/08/03