The VRX918S is a compact, high power, suspendable subwoofer system containing a 2268H neodymium magnet, patened Differential Drive 18" woofer in a front loaded, vented enclosure. The VRX918S was designed specifically for use in arrays with the VRX32LA.
"The Retrorocket Pro Features a Solid Alder Body, Bolt-on Maple Neck with a 22-Fret Rosewood Fingerboard, and a Versatile Fernandes Pickup Configuration for Tonal Bliss. The Pro Model brings the creative fire of the Fernandes Sustainer to the most popular guitar body shape in the world."