The SX218 achieves the ultimate in subwoofer performance for the most demanding applications – delivering very high output levels and superb transient performance with minimal distortion it is the perfect partner to WPC, with one subwoofer to every 2 top boxes required. With an operating range of 35Hz to 150Hz +/- 3dB, it houses dual 18-inch long-excursion (460mm)/4-inch (100mm) voice coil drivers with water-resistant cones and triple roll surrounds. Each driver is rated to handle 1000W AES, and has a magnet structure and suspension engineered for maximum linear excursion. The enclosure is constructed from multi-laminate birch ply and coated with hard-wearing textured paint. Eight reflex ports provide a large frontal area to reduce turbulent air noise, and a perforated steel grille protects the drivers from damage.