01
Open by construction
The bitstream, renderer and test suite are public. No membership, no per-unit royalty, no NDA to read the spec.
- Apache-2.0 spec and reference code
- Patent non-assertion pledge
- Governed by an open working group
Spec v2.1 ratified by the working group
Surround sound that belongs to everyone.
Auditorium is an open spatial audio format and a reference playback system — royalty-free, patent-free, and designed to run on hardware a community hall can actually afford.
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Deployed at
- Rio Planetarium
- Ghent Volkshuis
- Sundance Labs
- KTH Acoustics
- Cine Comunal Bogotá
The format
Object audio without the toll booth.
Every immersive format in wide use is licensed per-device and per-title. That prices out exactly the venues that need it most.
02
Scales down, not just up
One master file renders correctly from a 24-speaker dome to a laptop, degrading by design rather than by accident.
- 4.0 through 7.1.4 and custom domes
- Binaural fold-down built in
- Runs on a Raspberry Pi 5
03
Honest spatialisation
Object positions are absolute in metres, so a mix made in a studio behaves the same in a hall three times the size.
- Metric object coordinates
- Room calibration in the renderer
- Reference measurements published
Specification
- Container
- .aud / Matroska (MKA)
- Objects per stream
- up to 128
- Bed channels
- 4.0 – 7.1.4
- Sample rates
- 44.1 – 192 kHz
- Bit depth
- 16 / 24 / 32f
- Renderer latency
- < 12 ms
- License
- Apache-2.0
Get started
-
01
Install the toolkit
CLI encoder, renderer and calibration tools for macOS, Linux and Windows.
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02
Calibrate the room
Sweep the space with any measurement mic; the renderer solves for your geometry.
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03
Play anything
Encode a mix, or run existing stems through the object mapper.
brew install auditorium
Bring it to your room.
Community cinemas, school theatres, planetariums and studios run Auditorium on off-the-shelf amps. We'll help you size the rig for free.