If you go to a THX-certified theater these days, you might get this impressive new “Deep Note” trailer promoting the THX technology.

Be sure to listen to this one with headphones to hear it in THX Spatial audio!

What is THX? From Gizmodo:

Originally developed back in 1983 by Lucasfilm’s Tomlinson Holman as a way to ensure that the sound for Star Wars: Return of the Jedi would be accurately reproduced in theaters, THX is a quality control and certification system that takes into account everything from a cinema’s acoustic performance to the screen and projector’s image quality to even the amount of background noise heard inside the theater. Most audiences probably couldn’t hear the difference between a THX-approved theater and one that wasn’t, but what made THX popular among many movie fans was the iconic Deep Note glissando that played ahead of the film, which had originally been created by Lucasfilm’s James A. Moorer.

[THX Ltd]