Electronic Active Crossover Circuit Subwoofer Crossover NE5532 The audible band is in the frequency range 20 Hz to 20 kHz. Signal loud speakers are used, but they are not capable of transferring the entire audible band. Speakers are also... Electronics Projects, 18dB 20Hz 200Hz Subwoofer Crossover Circuit "audio control circuits, " Date 2020/04/28