As the larger of the two LCR speakers in the Ultra2 family, the KL-650-THX features a front-firing port for low bass extension dual 6.5-inch Cerametallic woofers and a 6- by 10-inch Tractrix® Horn Tweeter. The tweeter driver is a 1-inch titanium-dome compression unit designed specifically for use with horns to provide high output with low distortion. The clarity and distinction of this LCR can also be attributed to its top-of-the-line internal wiring.