This high-quality subwoofer low pass filter for your audio system. This subwoofer filter control using an IC op-amp as a filter and booster subwoofer. The IC op-amp is using LM224 and TL072. The subwoofer filter is high quality and high performance, it gives you more bass and sub on your audio that you have. Below its schematic diagram for subwoofer filter and control include the power supply schematic.
High-Quality Subwoofer Low Pass Filter Circuit Diagram