Curious, George?

The film is set in an unnamed underground city of the future, where sexual intercourse is outlawed and use of mind-altering drugs is mandatory. Narcotics are critical both in maintaining compliance among the city’s residents and also for ensuring their ability to conduct dangerous and demanding tasks for long periods of time. The inhabitants worship a godlike being known as “OMM”, whom they commune with in telephone booth-like areas known as “Unichapels”.
X-1138 works in a factory producing androids that function as police officers. The work is hazardous as it requires handling explosive and radioactive material.
It was the first feature-length film directed by Lucas, developed from his (almost) eponymous student film.

X is a trade name of a high-fidelity sound reproduction standard for movie theaters, screening rooms, home theaters, computer speakers, gaming consoles, and car audio systems.

X was developed by Tomlinson Holman at George Lucas’s company, Lucasfilm, in 1983 to ensure that the soundtrack for the third Star Wars film, Return of the Jedi, would be accurately reproduced in the best venues.

Give me X.
Hint: The name of the inventor goes into the answer

Answer

It is indeed THX. Anoop, Gandhi and Mr Evil monkey get it right. The title was referring to Curious George, the animated monkey that appears in Dolby digital trailers.