THX also provides certified theaters with a special crossover circuit whose use is part of the standard. THX-certified theaters provide a high-quality, predictable playback environment to ensure that any film soundtrack mixed in THX will sound as near as possible to the intentions of the mixing engineer. All sound recording formats, whether digital ( Dolby Digital, DTS, SDDS) or analog ( Dolby Stereo, Ultra Stereo), can be reproduced in a THX system. THX is a quality assurance system, not a recording technology. was founded on by Lucas and Holman, and headquartered in San Francisco, California. Deep Note was created by Holman's co-worker James A. The name is also an homage to Lucas's first film, THX 1138 (1971). THX was named after Holman's initials, with the 'X' standing for ' crossover' or 'experiment'. THX 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. The famous THX trailer that precedes movies is based on the Deep Note, with a distinctive glissando up from a rumbling low pitch. THX is a suite of high fidelity audiovisual reproduction standards for movie theaters, screening rooms, home theaters, computer speakers, video game consoles, car audio systems, and video games.

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