From the Manufacturer
The WS18X is a high performance sub-bass system designed for use with small to medium Wavefront systems, in both touring and install applications. It features a 1000 watt 18″ (460mm) drive unit with magnet structure and suspension engineered for maximum linear excursion. Theatre sound systems. Small to medium touring systems. Club sound reinforcement. Special effects sub-bass. Fitted with four pocket handles and four 4″ (100mm) castors for easy deployment, the WS18X features large area porting to reduce air noise. A top hat fitting allows mid-top cabinets to be mounted on the WS18X using the HAM09015 adjustable pole. WS18X subwoofers are designed to be powered by Martin Audio MA12K or MA9.6K amplifiers.