For applications requiring the sonic and practical advantages of integrating the subwoofers into the flying array, JBL offers the VRX918S, a compact, high power, suspendable subwoofer system using 18" Differential Drive woofers in front loaded vented enclosures. The VRX918S was designed specifically for use in arrays with the VRX932LA and is equipped with a top-mounted, threaded, M20 socket that can receive the optional SS4-BK adjustable pole. DIFFERENTIAL DRIVE WOOFERS Sound reinforcement professionals constantly ask for more power but less weight so JBL designed the VRX s drivers with much less weight than comparable drivers and yet significantly increased its power handling and output. DURABLE CONSTRUCTION VRX900 Series enclosures are constructed with premium quality birch plywood. Coated in JBL's rugged DuraFlex finish and heavily braced the systems are extremely ndurable, not to mention rigid and resonance free. The heavy duty steel grilles are internally lined with acoustically transparent foam to provide additional driver protection. Features: Integral rigging hardware for simple connection of VRX932LA line-arrays and optional array frame. 18 inch, 2268H Differential Drive woofer for extended low-frequency output Large port area for reduced distortion 20 mm threaded pole socket for solid, secure satellite speaker mounting Get your JBL VRX918S 18" High Power Flying Subwoofer  today at the guaranteed lowest price from Sam Ash Direct with our 45-day return and 60-day price protection policy. ??Warning: Cancer and Reproductive Harm-