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THX is a certification that is to ensure a standard of high-fidelity sound reproduction systems for theatrical movie theaters, screening rooms, home theaters, computer speakers, gaming consoles, and car audio systems. THX was developed by George Lucas' 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.
In 2002, the THX division of Lucasfilm was spun off as a separate company - THX, Ltd.