Combining and balancing all audio elements of a film into a cohesive soundscape with defined levels and spatial distribution.
Technical Details
Modern mixes operate with levels between -23 LUFS (Loudness Units Full Scale) for broadcast and -27 LUFS for cinema. Dynamics typically range between -40 dB and +6 dB, with dialogue usually between -20 dB and -12 dB. Surround formats utilize the following configurations: 5.1 with six discrete channels (L, C, R, Ls, Rs, LFE), 7.1 with eight channels, and Dolby Atmos with up to 128 object-based audio tracks. Mixing is done on calibrated monitoring systems according to X-Curve standards with an 85 dB SPL reference level.
History & Development
In 1931, RCA introduced the first multitrack mixing console for film productions. In 1940, Disney developed the first multichannel process, "Fantasound," with three front channels for "Fantasia." Dolby Stereo established itself in 1975 with "Tommy," followed by 5.1 surround in 1992 with "Batman Returns." Digital Theatre Systems (DTS) launched in 1993 with "Jurassic Park." Dolby Atmos revolutionized object-based mixing in 2012 with "Brave," enabling precise 3D positioning of sound objects.
Practical Application in Film
"Mad Max: Fury Road" (2015) used over 3,500 individual tracks for the final mix, with vehicle sounds built up in 16 layers. "Blade Runner 2049" employed Dolby Atmos with 64 simultaneous objects for immersive city soundscapes. The mixing process is divided into Pre-Mix (grouping by category), Final Mix (overall balance), and Print Master (technical adjustment for various playback formats). Typical mixing times are 2-4 weeks for feature films, depending on complexity and the number of formats.
Comparison & Alternatives
Mixing differs from editing through creative balance rather than mere assembly. Sound design develops sound material; mixing shapes its final presentation. Stem mixing creates separate main groups (dialogue/music/effects) for later adjustments, while Full-Mix directly produces the final version. Object-based mixing (Dolby Atmos, DTS:X) is increasingly replacing channel-based methods as it allows automatic adaptation to different speaker configurations. Immersive formats like 360° audio for VR require binaural or Ambisonics mixing instead of conventional surround techniques.