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] Template:Quotation


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] Template:Quotation

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 worksEdit

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 Bach's "Fugue in B Minor" were sources of inspiration for the 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 cultureEdit

Template:In popular culture 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 blow 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 Sesame Street, there was a parody of the THX logo and it reads "ABC: The Audience is Learning" before a Letter of the Day segment starts. The Deep Note sounded like kids singing along with the THX sound and some kids laugh in the background when the logo appeared. Above the logo is "Nucasfilm," another parody of Lucasfilm.
  • In the 2006 film Over the Hedge, Deep Note is featured as the animals perform a raid on Gladys Sharp's house. Penny and the three porcupine kids are tasked with setting up a camera system. Meanwhile, a porcupine turns on the television to the THX logo as well as Deep Note playing at full volume on the sound system, with the force of it blowing off his quills. Outside, Sharp's Persian grows suspicious, but Stella insists that it's the beating of her heart, holds him close, and harmonizes with the Deep Note. The two others then quickly change the channel to the camera video on the wiring, which stops the loudness.
  • In the very beginning of the 2006 film Tenacious D and the Pick of Destiny, Deep Note is parodied in the beginning by Jack Black and Kyle Gass with cartoon versions of themselves flying via flatulence propulsion, and the words "THC: The Audience is baking" appear on the screen.
  • The LucasArts adventure game The Curse of Monkey Island opens with a large 'CMI' logo with a Deep Note made by the sound of monkeys, accompanied by the caption "The Monkeys are Listening."
  • Promos for the Cartoon Network block Flicks featured a parody of the Deep Note.
  • A documentary on The IT Crowd Series One DVD has various male voices vocalise the Deep Note sound. As they reach the end, some of the voices in the background end up screaming. The first captions state that the video is "mastered for minimal sound and picture quality." This is followed by the logo where "THX" is replaced by "KEN", which when fully read in the context of the captions on the screen reads "Mastered by KEN using a VCR."
  • The New Jersey Nets and other teams use the Deep Note when there is about 10 seconds left in warm-ups. At the end of the Deep Note, the buzzers go off.
  • A similar sound can be heard as an Easter egg in μTorrent.
  • IGT video slot machines make the Deep Note as its startup sound when turned on.
  • In an episode, Home Sweet Hole from Back at the Barnyard, when Otis and Pip watch a DVD, at the beginning there is a parody of the THX logo that reads "BYX", and the Deep Note is sung by a choir.
  • When you start the Europe levels in Doritos Crash Course, there's a parody of the deep note.
  • The Deep Note appeared in the episode "The White Asparagus Triangulation" of The Big Bang Theory, in which Sheldon uses it as a guideline for what cinema seats he should be sitting at.
  • In Robot Chicken: Star Wars Episode III, during a skit involving a gathering of bounty hunters, the assassin droid IG-88 introduces his cousin THX-1138, who greets the room with the Deep Note which ends up shaking the foundation of the house.
  • Cirque du Soleil's show, Quidam pulls off a spectacular rendition of the Deep Note just before the German wheel and cloud swing acts start.
  • During the 88th Academy Awards, the Deep Note is heard while presenting the title screen for the Best Sound Mixing
  • Malmö Redhawks of the Swedish Hockey League plays the Deep Note right after puck drop, at the beginning of the game.
  • In The Boondocks episode "...Or Die Trying", Grandpa mimics the "Deep Note" when reassuring Jazmin that the theater they are going to is a quality theater.


  • The Brown Derbies, a collegiate a cappella group from Brown University, replicated Deep Note using only human male voices. The first track of their 1997 CD Nightcap is entitled "THX."
  • Another collegiate a cappella group, Redefined, from UW-Madison, replicated Deep Note with both male and female human voices as the first track on their self-titled 2002 debut album.
  • 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][12]
  • 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.[13]
  • The "Mega Lo Mania Remix" of Mylène Farmer's song "California" begins with Deep Note.Template:Citation needed
  • Rock band Asia used Deep Note as the opening for the song "Countdown to Zero" from their 1985 album Astra.[14]
  • Timbaland used Deep Note as the opening for the song "Intro with DJ Felli Fel" from the album Shock Value II.
  • Amberian Dawn used the Deep Note in the introduction for their song Incubus on their album The Clouds of Northland Thunder.
  • "Hell Is Living Without You" by Alice Cooper from the 1989 album Trash starts out playing Deep Note.
  • Drum and Bass artist Delta Heavy used the Deep Note in their song titled "Space Time".
  • Progressive metal band Dream Theater used a modified version of Deep Note during the Chaos in Motion tour.


External linksEdit

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