AC118S is a high power subwoofer system comprised of one 459 mm (18 in) low frequency driver in a vented, front-loaded configuration for extended bandwidth. The rectangular cabinet is fitted with M10 threaded suspension points for ultimate flexibility.

As a part of JBL's AE Application Engineered Series, a versatile family of loudspeakers for a wide variety of fixed installation applications, AC118S provides a natural low-frequency sound quality.