The Vandersteen Audio speaker lineup continues to evolve due to the research & development efforts that delivered the patented carbon-fiber Perfect-Piston drivers used in the flagship Model Seven. Vandersteen's Treo loudspeaker is now available in an optional Treo CT version (Carbon Tweeter). The Treo CT delivers a surprising amount of the air, space, and natural purity previously heard only in Vandersteen's top speaker models: the Quatro Wood CT, KĒNTO, and the Model Seven.