The HL-426 is a 17-pin Integrated Circuit (IC) developed by Pro Signal. It is a high-performance low-cost active filter and buffer amplifier designed with a wide range of frequency response characteristics, allowing it to be used in various audio applications. The HL-426 offers a high input impedance (typically >1 G?), low-resistor noise, wide frequency response, wide dynamic range, low distortion and low output impedance (typically <1 ?). It is also capable of providing both low-pass filter and high-pass filter functions. The HL-426 can be used for signal buffering, low-pass filtering, high-pass filtering, and signal conditioning. It is also ideal for surround sound systems and sound/video editing and mixing applications.