Bass Crossover two op amp circuit (TL072 tl071) integrated circuit based on the symmetrical +15 v-15v working voltage and frequency settings for gain potentiometer has two frequency range 10 … 60Hz aothor: tamircihasan Adjustable Subwoofer Crossover circuit pcb files... Electronics Projects, Frequency Adjustable Bass Crossover Circuit "audio control circuits, " Date 2019/08/02