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What is VOX?

Dialogic VOX is a compressed speech audio format optimized for telephony systems, voice mail, and interactive voice response.

What is AU?

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

When Should You Use VOX vs AU?

Use VOX When...

VOX shines in telephone systems, voice mail, ivr systems scenarios. The compact file sizes make it ideal for web distribution and daily workflow.

Use AU When...

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

VOX vs AU: Key Differences

  • •The core technical difference: VOX relies on lossy compression whereas AU uses lossless compression.
  • •The switch from lossy compression to lossless compression means you preserve full quality at the expense of larger file sizes.
  • •How transparency is handled: AU supports transparency, so alpha information is preserved during conversion.
  • •File sizes: VOX files typically range Very small, ideal for voice storage and AU files Small to medium, similar to WAV.
  • •Primary audience: VOX is built for telephone systems, voice mail, ivr systems scenarios, while AU focuses on legacy unix audio, sun workstation sound — pick the format that matches your output requirement.

Advantages of VOX

  • ✓The lossy nature of VOX means file sizes stay reasonable while handling Telephone systems, voice mail, IVR systems efficiently.
  • ✓From mobile devices to enterprise servers, VOX is recognized and supported everywhere.
  • ✓Storage and bandwidth costs drop significantly when using VOX thanks to its efficient compression.
  • ✓VOX is a first-class citizen in all major software ecosystems, from creative suites to development environments.

Advantages of AU

  • ✓The lossless nature of AU means file sizes stay reasonable while handling Legacy Unix audio, Sun workstation sound efficiently.
  • ✓From mobile devices to enterprise servers, AU is recognized and supported everywhere.
  • ✓The trade-off for AU's perfection is larger files — but for archival work, it is worth every megabyte.
  • ✓AU is a first-class citizen in all major software ecosystems, from creative suites to development environments.

Common Use Cases for VOX to AU Conversion

  • Conference call recordings
  • Field recording preservation
  • Music production and mixing
  • Podcast distribution
  • Voice recordings
  • Streaming services

Industry Applications

Medical TranscriptionRadio BroadcastingMusic ProductionPodcastingBroadcastingAudio Engineering

Best Practices for VOX to AU Conversion

  • →For VOX to AU: match the sample rate and bit depth to your delivery platform — 44.1 kHz / 16-bit is the standard for music
  • →Apply loudness normalization (LUFS) before conversion to ensure consistent volume across your audio library
  • →AU prioritizes quality — ensure your storage can accommodate the resulting file sizes
  • →Check that metadata tags (artist, album, track number) survive the conversion
  • →Convert a short segment first to verify quality at your chosen bitrate
  • →Keep a lossless master copy in case you need to re-encode for a different platform

Related Article

Video Compression Guide: Reduce File Size Without Losing Quality

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

Troubleshooting VOX to AU Conversion

  • !AU audio quality degraded vs VOX → use a higher bitrate (at least 256 kbps for music)
  • !AU file won't play on your device → check format compatibility with your player or platform
  • !Metadata (artist, album, title) lost after VOX to AU conversion → some formats like AU may not support ID3 tags
  • !Volume changed after converting VOX to AU → normalize audio levels before conversion for consistent playback

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Convert VOX files to AU online for free. High-quality conversion with no registration required.

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About VOX and AU

VOX

VOX (VOX audio) - Dialogic VOX, compressed speech audio for telephony. Best for telephone systems, voice mail, ivr systems.

AU

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

Format Comparison

CompressionLossy → Lossless
TransparencySupported
Use CaseConvert from telephone systems, voice mail, ivr systems to legacy unix audio, sun workstation sound
File Size~Small to medium, similar to WAV after conversion

FAQs

Is converting VOX to AU free?

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

How long does it take to convert VOX to AU?

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

What is AU best used for?

AU is ideal for legacy unix audio, sun workstation sound. Sun AU, legacy Unix audio format for Sun workstations

Does converting VOX to AU lose quality?

No, converting VOX to AU does not cause additional quality loss — AU uses lossless compression. However, any artifacts already present in the original VOX file will persist in the AU output.

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

AU files are typically 2-5x larger than equivalent VOX files because AU preserves all pixel data. This is expected and necessary for lossless quality.

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