Unique to every THX Certified Cinema is the THX "baffle wall.” Play THX 
If you were to peel away the screen at any THX Certified Cinema, you will see a massive wall of speakers housed in an acoustic baffle (speaker system enclosure).
The baffle wall is approximately the same size as the screen, providing a solid, smooth and uninterrupted surface to distribute sound throughout the auditorium. It produces a large sound image and accurately tracks sound elements with the onscreen action. This makes panning shots and off-screen sounds more believable and natural, helping to pull audiences into the storyline. Without a baffle wall, sound is uncontrolled – producing a weak, uneven image.
The baffle wall in a THX Certified Cinema controls the sound behind the screen – projecting a smooth audio experience out to the audience. Without the baffle wall, sound is uncontrolled behind the screen – producing a weak sound image that "jumps” across the screen.
