The CCL SUB is a compact, high-efficiency cardioid subwoofer engineered to deliver precise low-frequency reinforcement for professional sound reinforcement environments. Developed as part of the d&b audiotechnik CL Series, the CCL SUB is purpose-built for applications that demand accurate low-end control and high output within a streamlined footprint. Its integrated cardioid design ensures directivity control without requiring additional amplifier channels or external processing. This makes the CCL SUB particularly effective in venues where managing low-frequency dispersion is critical, such as corporate events, houses of worship, live performance spaces, and broadcast installations. The subwoofer incorporates a dual-driver configuration, consisting of a 15 inch forward-facing bass-reflex driver and a 10 inch rear-facing bandpass driver, enabling significant rear rejection while preserving frontal energy. Built to withstand demanding conditions, the CCL SUB is housed in a marine-grade plywood enclosure, coated with a weather-resistant 2K finish, and fitted with robust transport and stacking features. An M20 threaded insert accommodates pole-mounting of compatible top cabinets, allowing for a coherent and space-efficient system setup. The CCL SUB is a key element in achieving consistent, directional bass performance across a wide range of professional audio environments.