Spatial Audio Explained
A working engineer's guide to the formats behind 3D audio, and honest numbers on when the production budget is worth the result.
Spatial audio is not a single format. It is a loose umbrella for at least four distinct production chains — each with its own licensing costs, delivery specifications and listener assumptions.
The four main routes.
- Dolby Atmos. Object-based. 7.1.4 renderer minimum. Licensing applies on delivery.
- Sony 360 Reality Audio. Object-based, MPEG-H. Tooling is narrower but growing in classical.
- Ambisonics. Scene-based, patent-free. Our preferred capture format at heritage venues.
- Binaural two-channel. Not strictly spatial, but what most listeners actually hear — over headphones.
"Ninety-eight percent of your audience is listening on stereo earbuds in a noisy tram. Budget accordingly." — engineer's note from a 2025 Musikverein session.
Costs versus gains.
A typical Atmos mix of a 45-minute album runs €3,800–€6,200 in Vienna. A stereo master of the same material runs €800–€1,400. The listener experience difference is substantial in a calibrated home theatre — and largely imperceptible on earbuds during commute.
Where spatial actually shines.
Choral works, large ensembles, and sound-art installations are the clearest win. Pop and singer-songwriter material benefits less. If your record has more than three simultaneous voices in a reverberant room, spatial is worth the invoice. Otherwise, invest the same budget in a better stereo master and room treatment.