Dolby Atmos Explained for Film Producers

Why Atmos Changed Everything

For the first five decades of cinema sound, audio was mixed to a fixed configuration: a specific number of channels arranged at specific speaker positions. A 5.1 mix had six channels — front left, centre, front right, left surround, right surround, and a low-frequency effects channel — and every home system, cinema, and streaming platform played those same six channels regardless of the playback system's actual capability.

This meant that a mix made on a large theatrical stage played on a consumer soundbar with the same six channels, whether that soundbar had two drivers or twelve. The mix was channel-based. The sound designer placed audio into specific channels, and those channel assignments were fixed from the moment the mix was rendered.

Dolby Atmos changes this with object-based audio. Instead of assigning sounds to channels, the mixer assigns them to objects — three-dimensional positions in space with X, Y, and Z coordinates. When the Atmos renderer encounters a playback system, it calculates the optimal reproduction of those objects given the physical speakers available. A helicopter flying overhead in an Atmos mix plays from the ceiling speakers of a home theatre, the overhead array of a theatrical auditorium, and is virtualized through the processing of a soundbar — using the same single mix, adapted in real time.

The Bed and the Objects

An Atmos mix has two components: the bed and the objects. The bed is a fixed-channel foundation — typically 7.1 — that carries ambient soundscapes, music, and sounds that do not require precise spatial placement. The objects are discrete audio elements with spatial positioning data: individual footsteps, voices, a specific sound effect.

In practice, most mixes use a combination of both. Dialogue lives predominantly in the bed (anchored to the centre channel for consistency across playback systems). Key spatial effects — a phone ringing from a specific location, an approaching vehicle, environmental sound that needs to move through the space — are mixed as objects. The total object count varies by scene complexity, but a standard Atmos mix supports up to 128 simultaneous objects.

For the production team, the most important implication is that an Atmos mix does not need to be remixed for different delivery formats. A single Atmos master contains all the spatial information needed to render correctly to 5.1, 7.1, stereo, and any object-based configuration. The renderer handles downmixing. This is a significant operational advantage — one mix, multiple accurate deliverables.

Dolby Atmos Home Entertainment vs Theatrical

There are two Atmos certification tiers that producers and delivery teams need to understand. Dolby Atmos Home Entertainment (also called Atmos HE) is the format used by Netflix, Amazon Prime Video, Apple TV+, Disney+, and other streaming platforms. It is also delivered to Blu-ray. This format is mixed and mastered in a room certified to Dolby's Home Entertainment specification — a room tuned to simulate a home playback environment, not a cinema.

Dolby Atmos Theatrical (also called Atmos for cinema) is the version mixed for cinema release. It plays on cinemas equipped with Atmos rendering systems — currently several thousand screens globally, including most major multiplexes. Theatrical Atmos mixes have higher object counts and are designed for rooms with full overhead speaker arrays.

Trisha Studios is certified for Dolby Atmos Home Entertainment. This is the format required by all major streaming platforms. If your production is being delivered to theatres with Atmos capability, your re-recording mixer will discuss whether a theatrical fold-down of the Home Entertainment mix is sufficient, or whether a dedicated theatrical stage is required.

What Producers Need to Know Before the Mix

The mixing session begins with a mix preparation stage — sometimes called pre-dubbing. Dialogue, music, and effects are organised, cleaned, and balanced before the final mix session. For most productions, this preparation occupies more time than the final mix itself. Ensuring that all elements are properly labelled, that ADR has been correctly synchronised, and that music stems are clean before entering the room saves significant mix time.

Loudness specification varies by platform. Netflix requires an integrated loudness of -14 LUFS (Loudness Units Full Scale) as per the EBU R128 standard. Theatrical delivery follows its own specification. The re-recording mixer manages this, but producers should understand that the loudness target affects creative decisions in the mix — particularly how dynamic the mix can be.

The final deliverable for an Atmos mix includes the Dolby Atmos Master (DAMF file), printmaster stems in multiple configurations, and downmix compatibility checks. Most productions require a minimum of stereo, 5.1, and Atmos deliverables. At Trisha Studios, all of these are generated from the single Atmos session.

Common Questions

Dolby Atmos. Certified. At Trisha Studios.

Our Dolby Atmos Home Entertainment certified facility delivers to Netflix, Amazon, Apple TV+, Disney+ and theatrical specifications from a single session.