The EKX-18S is a 18" passive subwoofer. 1600 W (peak), 134 dB peak SPL on the EKX-18S utilizing highsensitivity transducers designed and engineered by EV. Lightweight, compact 15-mm wood enclosure with internal bracing, and durable EVCoat finish. Large slot ports for low distortion and excellent bass extension. Metal grille reinforcement bar (two bars on the EKX-18S). M20 threaded pole mount plate.