The THX-5000-SUR produces a smooth, seamless, broad distribution of sound by employing a pair of 5.25-inch Cerametallic™ woofers and dual 5-inch square Tractrix® Horn tweeters in a Wide Dispersion Surround Technology array. WDST is the industry's no-compromise approach to surround speaker design because it offers both rich, immersion surround sound and precise localization of individual effects from a speaker that has much more placement flexibility than conventional designs.