The Gemini GVX-SUB18P subwoofer features a 18" woofer speaker with a 3" voice coil and 62oz. magnet. It also has a built-in amp with limiter circuit, balanced XLR 1/4" combo input, balanced XLR output and high-pass output. The GVX-SUB18P is a great addition to any setup, especially when paired with the GVX Series 12" and 15" loudspeakers. Other features include a perforated steel mesh grille, recessed flush handles, phase inverter switch, a 35mm pole mount fitting, and a water-resistant, textured black paint finish. Like the rest of Gemini's GVX Series of loudspeakers and powered subwoofers, the GVX-SUB18P has a sleek, compact design and provides you with accurate, detailed midrange and pleasant, smooth highs. These speakers can be driven to perform at their best even when pushed to their limits.