The JBL PRX418S is a high-performance 18-inch passive subwoofer designed as part of JBL's PRX series for portable sound reinforcement and fixed installations. It is engineered to deliver powerful, deep bass that extends the low-frequency response of a full-range PA system, making it suitable for live music, DJ performances, and venues requiring impactful low-end. The subwoofer features a long-excursion 18-inch driver housed in a carefully tuned, ported enclosure that maximizes efficiency and output while minimizing distortion. Its robust construction and thoughtful design make it a reliable component for both touring musicians and system integrators who need to enhance the bottom end of their sound system without the complexity of active electronics.

Built into a durable, plywood cabinet with a textured finish and ergonomic handles, the PRX418S is designed for easy transport and setup. It includes multiple rigging points and a pole-mount socket, offering versatile deployment options as a standalone unit or integrated with PRX series full-range speakers on tripod stands. As a passive design, it requires an external power amplifier, allowing sound engineers to select amplification that matches their specific power requirements and system configuration. The subwoofer's high power handling and sensitivity ensure it can produce high sound pressure levels with clean, articulate bass response, making it an effective tool for filling small to medium-sized venues with rich, full-range sound.