THX, the THX logo, and the THX Deep Note audio mark are registered trademarks of THX Ltd.
THX’s Deep Note was created by Dr. James A. Moorer. His “The Deep Note” is THX’s sound explosion.
The sonic logo is used on trailers for THX-certified movie theaters, home video releases, video games, and in-car entertainment systems. The Deep Note debuted in 1983 at the premiere of Star Wars: Episode VI—Return of the Jedi in Los Angeles.1
The U.S. trademark registration for the first version of the THX sonic logo contains this description of it:
The THX logo theme consists of 30 voices over seven measures, starting in a narrow range, ...
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