Updated October 2026 · Spatial and immersive audio
Object-based mixing treats each sound as a separate element with its own position and behaviour, stored as metadata alongside the audio. The playback system then renders the objects for the listener’s speakers or headphones. It gives the listener more flexibility, but it asks creators to plan positions and levels carefully and to check how each player renders them.
Traditional mixing puts sounds into fixed channels, such as left and right in stereo or a set of speakers in a surround layout. Object-based mixing takes a different approach. Each sound, or object, is kept as a separate element with information about where it should appear and how it should move. The playback system then decides how to render those objects for the listener’s equipment. The approach has become part of several immersive formats, and it changes how creators plan their work.
This post explains the idea, why it matters, what creators must do differently and where the approach can go wrong. It is written for people who may encounter object-based delivery without being the ones who build the renderer.
In an object-based mix, a voice, a drum, a sound effect or a piece of ambience is stored as its own object, together with metadata that describes its position and its size in the space. The audio is not locked to any particular set of speakers. The metadata tells the playback system where the sound should be, and the system works out how to produce that impression on the speakers or headphones it has.
The benefit is flexibility. The same mix can be rendered for a home soundbar, a pair of headphones or a larger room, and each one will try to place the objects in the right place for that setup.
Listeners with capable equipment may hear sounds placed more precisely around them, with less of the compromise that comes from forcing everything into a fixed layout. Some systems also adapt to the room or the listener’s position, which can improve the effect. For immersive music and film, object-based delivery can allow the same creative intent to reach a wider range of systems.
That benefit depends on the playback system doing its job well, and on the listener having the right equipment. A basic player may simply reduce the object mix to stereo, which is why a stereo fallback is still essential.
Object-based mixing asks for more planning. Creators must decide where each important object sits, how large it is, and how it should behave if the listener’s system is simpler than expected. Keep the important objects, such as the speech, at positions that work in every rendering, and avoid placing essential information only in an effect that may be lost.
Think about the number of objects too. A mix with many objects can be heavy to render and may not play well on every device. Keep the mix as simple as the story allows.
Test the mix on each playback path that listeners will use: a headphone player, a soundbar, a phone and the stereo fallback. Each may render the objects differently. Listen for speech that becomes hard to follow, effects that disappear and levels that jump between versions. A rendering that sounds good in one studio may not sound good in another.
Because the playback system decides the final layout, the loudness can differ between renderings. Check the overall level of the stereo fallback against your target, and listen to the spatial version at the same playback level. The LUFS meter can measure the stereo export, which is the version you can verify directly.
Object-based mixing suits immersive music, film and interactive projects, where the creator wants the sound to adapt to the listener. For a conversation podcast or a simple voice-over, it is rarely necessary. The extra work pays off only when the spatial placement adds meaning or experience.
Object-based deliverables often pass through a platform or distributor, and each may treat the file differently. Ask in writing what they accept, whether they render the objects themselves, and what they do to the stereo fallback. A platform that converts your object-based file to stereo on its own may produce a different result from the one you checked, so ask to see the output if they allow it. Keep the answers with your project records.
Agree a delivery specification before you finish the mix. A short document that names the file format, the channel layout, the loudness target and the fallback is easier to follow than a series of emails, and it protects both sides if the delivery is questioned later.
Object-based formats and their renderers are developing quickly, and different platforms support different features. Descriptions of what a format can do often come from the companies that make it. Test the claims on the equipment your listeners use, and keep your expectations realistic.
Whatever format you choose, the core mix must be clean. The LUFS meter helps check the loudness of the stereo export, and the Tunedzy Go page covers cleaning a phone recording. For the simpler delivery options, read the binaural comparison in this series.
Integrated LUFS, true peak and streaming targets. Runs in your browser, nothing is uploaded.
No. Surround stores fixed channels, while object-based audio stores sounds with positions for rendering.
The playback system renders them for the listener’s equipment, so the result varies.
You need a tool that supports object metadata, and you must test on the playback paths your listeners use.
Rarely. For speech shows, a clean stereo mix usually serves listeners best.
