THX

THX Ltd. is an American company headquartered in San Francisco, California, and founded in 1983 by George Lucas. It develops the "THX" high fidelity audio/visual reproduction standards for movie theaters, screening rooms, home theaters, computer speakers, gaming consoles, car audio systems, and video games.

The current THX was created in 2002 when it spun off from Lucasfilm Ltd. 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. THX was named after Holman, with the "X" standing for "crossover" or possibly "experiment" as well as in homage to Lucas's first film, THX 1138. The distinctive glissando up from a rumbling low pitch used in the THX trailers, created by Holman's coworker James A. Moorer, is known as the "Deep Note".

The THX system is not a recording technology and it does not specify a sound recording format: all sound formats, whether digital (Dolby Digital, DTS, SDDS) or analog (Dolby Stereo, Ultra Stereo), can be "shown in THX". THX is mainly a quality assurance system. 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. THX also provides certified theaters with a special crossover circuit whose use is part of the standard. Certification of an auditorium entails specific acoustic and other technical requirements; architectural requirements include a floating floor, baffled and acoustically treated walls, non-parallel walls (to reduce standing waves), a perforated screen (to allow center channel continuity), and NC30 rating for background noise ("ensures noise from air conditioning units and projection equipment does not mask the subtle effects in a movie's soundtrack.").

Although not owned by Universal Studios, THX's services are often used in some Universal and DreamWorks feature length films, typically for theatrical use.

United States

 * Topia (1981) Broadway (1998 VHS & DVD releases/2001 DVD release) & Broadway (VHS)/Cavalcade (DVD) (2002 VHS & DVD releases)
 * Romeo and Juliet (1994) Broadway (1995 Laserdisc release)
 * Ghost Vision (1995) Broadway (Laserdisc)/Broadway 2000 (DVD) (1996 Laserdisc/2001 DVD release) & Tex (2005 10th Anniversary DVD release)
 * Ama and the Mysterious Crystal (1997) Broadway (Widescreen VHS and DVD)/Cimarron (Laserdisc) (1998 Widescreen Edition VHS & Laserdisc releases/2001 DVD release)
 * Antz (1998) Tex (2005 Special Edition DVD release)
 * The Prince of Egypt (1998) Broadway (2005 Special Edition DVD release)
 * Galaxion (1999) Broadway (1999 VHS & DVD releases)
 * Paint World (1999) Broadway (2000 VHS & DVD releases) & Tex (2004 Special Edition DVD release)
 * The Road to El Dorado (2000) Broadway (2005 Special Edition DVD release)
 * Chicken Run (2000) Tex 2 Moo Can (2005 Special Edition DVD release)
 * Cassiopeia (2000) Broadway (VHS)/Tex (DVD) (2001 VHS and DVD releases)
 * Mistress Masham's Repose (2001) Broadway (2001 VHS & DVD releases)
 * Shrek (2001) Shrek (2003 DVD release)
 * Momo: The Conquest of Time (2001) Broadway (2002 VHS & DVD releases)
 * The Adventures of Blake & Blainley Movie (2002) Broadway (VHS)/Tex 2 Moo Can (DVD) (2002 VHS & DVD releases)
 * Spirit: Stallion of the Cimarron (2002) Tex (2005 Special Edition DVD release)
 * Me & Mobo (2002) Broadway (2003 VHS & DVD releases)
 * Santa vs. the Snowman 3D (2002) Broadway (VHS)/Tex 2 Moo Can (DVD) (2004 VHS & DVD releases)
 * Magina (2003) Broadway (VHS)/Cavalcade (DVD) (2003 VHS & DVD releases)
 * Interstella 5555: The 5tory of the 5ecret 5tar 5ystem (2003) Broadway (2003 VHS & DVD releases)
 * Sinbad: Legend of the Seven Seas (2003) Tex 2 Moo Can (2005 Special Edition DVD release)
 * Computeropolis (2004) Tex 2 Moo Can (2004 VHS & DVD releases) & Tex (2006 DVD release)
 * Zina and the Vivid Crew (2004) Tex 2 Moo Can (2005 DVD release)
 * M.I.S.S.I.O.N. (2005) Tex (2005 DVD release)
 * Curious George (2006) Tex (2006 DVD release)
 * BJ and Wally (2006) Tex (2006 DVD release)
 * The Pirates Who Don't Do Anything: A VeggieTales Movie (2008) Amazing Life (2008 DVD release)
 * Cinnamon the Movie (2008) Amazing Life (2008 DVD release)

UK/Australia

 * Topia (1981) Broadway (2001 DVD release)
 * Paint World (1999) Broadway (2000 DVD release)
 * Mistress Masham's Repose (2001) Broadway (2001 DVD release)
 * Momo: The Conquest of Time (2001) Broadway (2002 DVD release)
 * The Adventures of Blake & Blainley Movie (2002) Tex 2 Moo Can (2002 DVD release)
 * Me & Mobo (2002) Broadway (2003 DVD release)
 * Magina (2003) Cavalcade (2003 DVD release)
 * Computeropolis (2004) Tex 2 Moo Can (2005 DVD release)
 * Zina and the Vivid Crew (2004) Tex 2 Moo Can (2005 DVD release)
 * M.I.S.S.I.O.N. (2005) Tex (2006 DVD release)
 * BJ and Wally (2006) Tex (2007 DVD release)

Trivia

 * The logo has been known to frighten younger viewers mainly with its audio trademark, the Deep Note.
 * The THX Shrek logo was originally intended to show before the original 2001 theatrical release of Shrek but was delayed until 2003 due to the ongoing rivalry between DreamWorks and Disney at the time (the debut date given reflects the scuttlebug that it was supposed to premiere before Pixar's Monsters, Inc. before Disney threatened to blacklist THX over the trailer).
 * The THX logo along with its Deep Note briefly appears in DreamWorks Animation's 2006 film Over the Hedge.
 * The THX logo was parodied in The Simpsons episode "Burn Heir".
 * On a similar note it was also parodied in the Tiny Toons Adventures TV movie "How I Spent My Vacation".

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