ZETHUS SERIES ZETHUS-218S PASSIVE DUAL 18 SUB: The Sound Town ZETHUS-218S passive subwoofer features two 18' high-power transducers, each with a 4' voice coil and an aluminum demodulating ring, delivering a robust 1600W RMS and 3200W program power output. This setup ensures deep, rich, and punchy bass, enhancing your audio experience TOUR-GRADE CONSTRUCTION: The ZETHUS-218S cabinet is constructed from premium multi-layered birch plywood and protected by a 14-gauge steel grille with anti-corrosion treatment and a tough textured coating, making it durable enough to withstand the rigors of extensive touring SEAMLESS INTEGRATION: Pair the ZETHUS-218S subwoofer with ZETHUS-210B or ZETHUS-208BV2 full-range array speakers using the ZETHUS-SF1 mounting frame (full-range speakers and mounting frame sold separately) for a cohesive and powerful sound system that provides precise and immersive audio performance for a variety of settings