What Does THX Mean?
THX is a standard as well as a certification for high-fidelity audio/visual reproduction for cinemas, theaters, screening rooms, home theaters, consumer-grade and professional speakers, car audio systems as well as many others. Contrary to popular belief, THX is not an audio/video or encoding format, but is a standard which ensures that the audio/video presentation is reproduced exactly as the original creator intended, so it has nothing to do with how the media was created but deals extensively with the equipment and environment used to present the media.
Techopedia Explains THX
THX was originally conceived at Lucasfilm studios when George Lucas asked Tomlinson Holman to develop a way to ensure that the soundtrack of “Return of the Jedi,” the third “Star Wars” film, was accurately reproduced in the best screening venues. It was both named after Tomlinson Holman with the “X” standing for crossover or experiment, and the name was also homage to Lucas’ first film, “THX 1138.”