System 10 THX Ultra 2TM Certified "Cinema 5.1" The THX Ultra2 Certified System 10's amazing tone quality is coupled with a minimalist design. Brushed aluminium elements create an interesting contrast to the black high glass finish. The flat membrane on the front loudspeaker creates a restrained and elegant appearance. Precise sound for the front and rear. The front speakers, with their two woofers, midrange driver and super tweeter precisely deliver frequencies from 80 - 22000 Hz. Superb!