The Martin Audio SX218 Dual-Driver, Direct Radiating Subwoofer delivers very high output levels and superb transient performance with minimal distortion. With a tour-grade plywood enclosure and a waterproof cone, the Martin Audio SX218 professional subwoofer’s performance with improve your sound system during your next set at any small and/or medium-sized venue. With an operating range of 35Hz-150Hz ± 3dB, it houses dual 18” long-excursion (460mm)/4 inch (100mm) voice coil drivers with water-resistant cones and triple roll surrounds. Each driver is rated to handle 1000 watts AES and has a magnet structure which is suspension engineered for maximum linear excursion.