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What is AU?

Sun AU is the native audio format for Sun Microsystems workstations, using simple mu-law encoding or uncompressed PCM.

What is DFF?

DFF files are built around lossless compression. Designed for audiophile music, high-resolution audio archiving, they use the audio/x-dff MIME type and typically range from varies by content.

When Should You Use AU vs DFF?

Use AU When...

Choose AU for legacy unix audio, sun workstation sound. It delivers archival-grade quality that professionals rely on for critical work.

Use DFF When...

DFF shines in audiophile music, high-resolution audio archiving scenarios. The pixel-perfect output meets the demands of professional production environments.

AU vs DFF: Key Differences

  • •AU uses lossless compression while DFF uses lossless compression — both take the same approach to file size management.
  • •Neither format changes compression philosophy — both are lossless compression — so any size differences are due to encoding efficiency, not a shift in quality approach.
  • •Transparency: Supported in DFF
  • •File sizes: AU files typically range Small to medium, similar to WAV and DFF files N/A.
  • •Primary audience: AU is built for legacy unix audio, sun workstation sound scenarios, while DFF focuses on audiophile music, high-resolution audio archiving — pick the format that matches your output requirement.

Advantages of AU

  • ✓At its core, AU relies on lossless encoding — a design choice that makes it perfect for Legacy Unix audio, Sun workstation sound.
  • ✓You won't run into compatibility issues with AU — it's a universal standard across platforms.
  • ✓File size management with AU: larger files guaranteed to match the original exactly.
  • ✓Every major application in the Legacy Unix audio, Sun workstation sound space supports AU natively.

Advantages of DFF

  • ✓DFF compresses data using lossless methods, keeping file sizes manageable for Audiophile music, high-resolution audio archiving.
  • ✓Industry-wide support means DFF files open anywhere — from legacy systems to the latest devices.
  • ✓Lossless quality makes DFF the gold standard for archival and master copies.
  • ✓From professional software to open-source alternatives, DFF works out of the box.

Common Use Cases for AU to DFF Conversion

  • Sound design
  • Language learning
  • Professional broadcasting
  • Video game audio assets
  • Film soundtracks
  • Radio commercials

Industry Applications

AccessibilityVoice-overAudio ArchivingGame AudioFilm Post-productionAudiobook Publishing

Best Practices for AU to DFF Conversion

  • →Converting AU to DFF: DFF preserves full audio fidelity — ideal for archiving master recordings
  • →Normalize audio levels before conversion for consistent playback volume
  • →DFF excels in professional audio workflows
  • →Always keep a backup of your original files before converting
  • →Choose the appropriate quality settings for your specific use case

Related Article

Video Compression Guide: Reduce File Size Without Losing Quality

Learn more about AU and DFF formats in our detailed guide.

Troubleshooting AU to DFF Conversion

  • !Clicks or pops in the converted DFF → sample rate conversion can introduce artifacts; use a clean multiple of the source rate
  • !DFF file has silence at the beginning or end → trim the source AU file before converting to avoid unnecessary padding
  • !Stereo image collapsed after converting AU to DFF → verify that the converter preserves channel mapping for multichannel audio
  • !The converted DFF clips or distorts at peaks → reduce the gain or apply a limiter before conversion to prevent hard clipping

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About AU and DFF

AU

AU (AU audio) - Sun AU, legacy Unix audio format for Sun workstations. Best for legacy unix audio, sun workstation sound.

DFF

DFF (DFF) - DSDIFF, Direct Stream Digital audio for SACD and high-res audio. Ideal for audiophile music, high-resolution audio archiving.

Format Comparison

CompressionLossless → Lossless
TransparencySupported
Use CaseConvert from legacy unix audio, sun workstation sound to audiophile music, high-resolution audio archiving
File Size~Standard file sizes after conversion

FAQs

Is converting AU to DFF free?

Yes, GoConvertFile offers free conversion of AU to DFF for files up to 100MB. No registration required.

How long does it take to convert AU to DFF?

Most AU to DFF conversions complete within seconds for standard-sized files. Larger files may take longer depending on the conversion complexity.

What is DFF best used for?

DFF is ideal for audiophile music, high-resolution audio archiving. DSDIFF, Direct Stream Digital audio for SACD and high-res audio

What file size should I expect after converting AU to DFF?

File size after AU to DFF conversion depends on the content complexity and quality settings. Both formats use similar compression approaches so sizes are comparable.

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