The Pendulum Audio OCL-500 is a high-end, 500-series optical compressor based on the circuitry of the acclaimed OCL-2, offering transparent, clean compression without tubes. It features a transformerless, Class-A solid-state makeup gain stage for minimal coloration, making it ideal for preserving the natural tone of audio sources. With six selectable time-constant modes—including Fast, RMS, and Vintage options—plus a sidechain high-pass filter to reduce low-frequency pumping, the OCL-500 delivers versatile, musical dynamics control in a compact single-slot format.