For applications requiring the sonic and practical advantages of integrating the subwoofers into the flying array JBL offers the VRX918S and the VRX915S, two compact, high power, suspendable subwoofer systems using 15 inch and 18 inch Differential Drive® woofers in front loaded vented enclosures. A powered 18 inch option, VRX918SP is also available. The VRX918S was designed specifically for use in arrays with the VRX932LA, as the VRX915S complements perfectly the VRX928LA. The VRX915S-WH is optimized for permanent installation with no handles or pole mounts attached.