Deep Note

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The Deep Note in audio editing software Audacity

The Deep Note is THX's audio trademark, being a distinctive synthesized crescendo that glissandos from a low rumble to a high pitch. It was created by Dr. James A. Moorer,[1] a former employee of Lucasfilm's Computer Division in late 1982.[2] The sound is used on trailers for THX-certified movie theaters, home video, video games, and car infotainment systems.

The Deep Note debuted at the premiere of Return of the Jedi in Los Angeles.[2] Since then, it has gone on to be a pop culture icon both in meme and cult nature, and had been redesigned and rerecorded for the 2015 "Eclipse" trailer.


The U.S. trademark registration for the first version of the sound contains this description of it:[3]

The THX logo theme consists of 30 voices over seven measures, starting in a narrow range, 200 to 400 Hz, and slowly diverting to preselected pitches encompassing three octaves. The 30 voices begin at pitches between 200 Hz and 400 Hz and arrive at pre-selected pitches spanning three octaves by the fourth measure. The highest pitch is slightly detuned while there are double the number of voices of the lowest two pitches.

Spectrogram made using Spek

Lucasfilm version (1983-2015)[edit]

The first version of the Deep Note made its debut before the first THX trailer, Wings, that preceded the premiere showing of Return of the Jedi. Two different interpretations of the note ran concurrently with the 1983 version in both the Grand trailer and the mid-90s reorchestration of the Cimarron trailer. The Deep Note originally transitioned from a soft to loud intensity, and over the years has been remixed digitally, as new technology developed. In 1993, the Deep Note was cut short and pitched higher (ending in an E chord rather than a D), to save time for Laserdisc and again in 1995 for VHS. In 1996, with the debut of Tex, the Deep Note was low-pitched and cut short which is different than other versions. It was later used in the DVD version of the digitally mastered variant of the iconic Broadway trailer in 1997, then later with both the Ziegfeld and Tex Action trailers in 2006. In 2007, for the Amazing Life trailer, the Deep Note had been cut short to the single note (where both sounds stay in one pitch), in favor of other sound effects. However, in the last two trailers to use the 1983 note, both based on the famous Broadway trailer, the sound was played in full.

The sound is perceived as louder than it actually is; sound designer Gary Rydstrom explains that, "from a technical standpoint, 'Deep Note' just feels loud because it has a spectrum of frequencies that grows from small to large."[2]

James A. Moorer said in a 2005 interview, "I like to say that the THX sound is the most widely-recognized piece of computer-generated music in the world. This may or may not be true, but it sounds cool!"[4]

Although Moorer had initially claimed that the score consisted of about 20,000 lines of code,[4] he subsequently corrected the statement and elaborated:[5]

The original 30-year-old C program is 325 lines, and the “patch” file for the synthesizer was 298 more lines. I guess it just felt like 20,000 lines when I did it.

Given that it was written and debugged in 4 days, I can’t claim the programming chops to make 20,000 lines of working code that quickly. But, to synthesize it in real time, in 1983, took 2 years to design and build a 19” rack full of digital hardware and 200,000 lines of system code to run the synthesizer. All that was already done, so I was building on a large foundation of audio processing horsepower, both hardware and software. Consequently, a mere 325 lines of C code and 298 lines of audio patching setup for the 30 voices was enough to invoke the audio horsepower to make the piece.

Regenerated version (2015-present)[edit]

In April 2015, THX introduced a new trailer named Eclipse, which is accompanied by an updated, more powerful version of the Deep Note, also created by Moorer. It is described as being "intensely more complex, taking the audience on an epic sensory journey unlike anything they've experienced before."[6] This version of the Deep Note was created entirely digitally so it could play on Dolby Digital 7.1 and Dolby Atmos systems, and Moorer created 30-second, 45-second and 60-second versions of it.[7] Moorer used around eighty voices in the remake, as opposed to thirty in the original 1982 version. In an interview with Yahoo, Moorer said "I kept thinking: That’s the way I wanted it to sound originally. I think it’s as far as you can take it."[8]

Previous works[edit]

Prior to the creation of the Deep Note, several other works made use of similar techniques of frequency spread.

In their book Analog Days, Trevor Pinch and Frank Trocco point to the track "Spaced," from the 1970 Beaver & Krause album In a Wild Sanctuary as the source for Deep Note. They quote synthesizer builder Tom Oberheim as saying the original analog form is much richer than the "digital perfection" used in movie theatres.

Another recognized predecessor to the Deep Note is a part in the song by The Beatles, "A Day in the Life", using a full orchestra. However, unlike the Deep Note, the resolving high chord is never held, but instead brought to a stop. Moorer has admitted that both "A Day in the Life" and a fugue in B minor by Bach were sources of inspiration for the Deep Note.[9]

A very similar sound occurred in the Styx song "Krakatoa" on their album The Serpent is Rising,[10] as well as in the soundtrack to the 1979 movie When a Stranger Calls.

In popular culture[edit]

The perceived loudness of the Deep Note is frequently depicted as having actual destructive effects:

  • The 1992 direct-to-video film Tiny Toon Adventures: How I Spent My Vacation shows a Deep Note–like trailer (which features a hand holding a baton) quite literally blowing the audience away, sending many people flying and wrecking the theater, concluding with the text, "THUD Sound System, A division of Mucasfilm Ltd. The Audience Is Now Deaf." This was a reference to the Cimarron trailer.
  • The episode of Bill Nye the Science Guy called "Sound" parodied the logo, replacing "THX" with "SOUND, the Audience is listening". Instead of the Deep Note playing, an orchestra tunes up. Another reference to the Cimarron trailer.
  • In a 1994 episode of The Simpsons entitled "Burns' Heir", a THX trailer plays before a film, literally sending the audience to the edge of their seats, shattering eyeglasses, teeth, and even causing one person's head to explode; the audience whoops in response. Grampa Simpson shouts, "Turn it up! Turn it up!" This segment was later turned into a THX theatrical trailer.
  • In the 2006 film Over the Hedge, Deep Note is featured as the animals perform a raid on Gladys Sharp's house, although it is notably longer than usual.
  • Mickey Rapkin narrates in his book Pitch Perfect: The Quest for Collegiate A Cappella Glory the live performance of Deep Note by the BYU's a cappella group Vocal Point in the 2006 ICCA, included in their award winning set that year.[11]
  • Rapper Dr. Dre was sued in 2000 by Lucasfilm, then-owner of THX, for using an unauthorized cover of Deep Note on his album 2001.[12]
  • Rock band Asia used Deep Note as the opening for the song "Countdown to Zero" from their 1985 album Astra.[13]
  • The 2006 film Tenacious D and the Pick of Destiny parodies the Deep Note and THX in the film's opening sequence. However, the script "THX" has been altered to read THC, a compound found within cannabis. Furthermore, the "Deep Note" is changed to the sound of an orchestra of farting noises.


  1. ^ Moorer, James A. "James A. Moorer Personal Website". Retrieved December 3, 2006. 
  2. ^ a b c THX Ltd. "THX Trailers". Retrieved December 3, 2006. 
  3. ^ "Trademark Applications and Registrations Retrieval (TARR)". United States Patent and Trademark Office. Retrieved December 3, 2006. 
  4. ^ a b Whitwell, Tom (May 25, 2005). "TINY MUSIC MAKERS: Pt 3: The THX Sound". Music Thing. Retrieved December 3, 2006. 
  5. ^ Kirn, Peter (April 8, 2015). "Q+A: How the THX Deep Note Creator Remade His Iconic Sound". Create Digital Music. Retrieved April 10, 2015. 
  6. ^ THX Ltd. (April 3, 2015). "THX Releases Rejuvenated Versions Of Iconic 'THX Deep Note' Sound With Global... -- HOLLYWOOD, Calif., April 3, 2015 /PRNewswire/ --". 
  7. ^ Welch, Chris (2015-04-15). "THX just remade the iconic 'Deep Note' sound you hear before movies". The Verge. Vox Media, Inc. Retrieved 2016-03-10. Moorer composed 30-, 45-, and 60-second versions of the new Deep Note, but for now THX is only sharing the shortest cut as part of its new 'Eclipse' trailer,… 
  8. ^ "The 'Star Wars'-Inspired History of the Iconic THX Audio Logo". April 2, 2015. 
  9. ^
  10. ^ Styx - Krakatoa/Hallelujah Chorus. January 14, 2010 – via YouTube. 
  11. ^
  12. ^ Dansby, Andrew (April 21, 2000). "LucasFilm (sic) Taking Dr. Dre to Court". Rolling Stone. Archived from the original on August 4, 2009. Retrieved December 3, 2006. 
  13. ^

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