The JRX118S is a 1x18 in. compact (passive) subwoofer, rated at 1400 watts peak power capacity and 350 watts continuous. It includes a newly designed JBL 18 in. woofer with a cast frame and 3 in. voice-coil.

About the JRX100 Series
JBL designed the new JRX100 series for cost-conscious musicians, DJs and other users of live sound reinforcement speakers. All full-range models feature Neutrik Speakon and 1/4 in. input connectors. JRX100 cabinets are constructed of carpet-covered, 3/4 in. MDF -- a material that is structurally and acoustically superior to the particleboard that is used by many competitive products. To minimize distortion, heavy gauge wire is used for inductors and SonicGuard high-frequency driver protection guards against damage caused by inadvertent overpowering of the system. The JRX115 and JRX112M's innovative, new dual-angle pole socket allows them to be mounted in either a conventional, vertical position, or with a 10 degree down angle. By aiming the speaker down, you get more even audience coverage and reduce the destructive acoustic reflections from walls. JBL constructs the JRX enclosures with advanced adhesives and closely mechanically spaced fasteners, not just glue. They use non-resonant, all metal handles, and an 18-gauge, full metal grille. All JRX100 models have passed the same 100-hour, full rated-power torture test that JBL high-end touring systems must survive.