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AU at a glance
AU
AU belongs to an earlier multimedia era where workstation and Unix vendors often had their own practical audio defaults.
DFF at a glance
DFF
DFF belongs to the Super Audio CD era, when DSD production chains needed a dedicated interchange wrapper distinct from mainstream PCM-oriented studio formats.
Format comparison
| Feature | AU | DFF |
|---|---|---|
| File type | Audio | Audio |
| Extensions |
|
|
| MIME type |
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| Created year | 1987 | 2000 |
| Inventor | Sun Microsystems | Philips and Sony |
| Status | active | active |
| Primary use cases |
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| Multitrack support | Not supported | Not supported |
| HDR support | Not supported | Not supported |
| Streaming ready | Not supported | Not supported |
When to use each format
When to use AU
- Your source file is already in AU.
- Preserve source expectations before exporting to DFF.
- AU is commonly used in audio workflows.
When to use DFF
- Your target workflow expects DFF.
- Improve delivery compatibility with DFF.
- DFF is commonly used in audio workflows.
FAQs
Why convert AU to DFF?
Convert to DFF when preserving SACD-derived masters, moving 1-bit DSD recordings between specialist audio tools, or maintaining an audiophile archive that prioritizes native DSD playback.
It is most useful in high-resolution music preservation and studio workflows that stay within the DSD ecosystem.
What changes when converting AU to DFF?
This conversion changes how the format behaves in downstream tools and delivery environments.
What should I review after converting AU to DFF?
Validate output quality on representative files and confirm the target format behaves correctly in the destination workflow.