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What is WMA?

WMA (Windows Media Audio) is Microsoft's proprietary audio format designed to compete with MP3.

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 WMA vs AU?

Use WMA When...

WMA is built for windows media, legacy audio players. Think of it as the practical workhorse — small files, big compatibility, no fuss.

Use AU When...

For legacy unix audio, sun workstation sound, nothing beats AU. It sets the standard for quality, trusted by professionals who cannot afford compromises.

WMA vs AU: Key Differences

  • •The core technical difference: WMA relies on lossy compression whereas AU uses lossless compression.
  • •Converting from WMA to AU changes compression type: lossless source becomes larger but with full quality preservation.
  • •Alpha channel support: AU lacks transparency support.
  • •Storage footprint: Similar to MP3 at equivalent quality for WMA vs Small to medium, similar to WAV for AU.
  • •Primary audience: WMA is built for windows media, legacy audio players scenarios, while AU focuses on legacy unix audio, sun workstation sound — pick the format that matches your output requirement.

Advantages of WMA

  • ✓WMA applies lossy compression specifically calibrated for Windows Media, legacy audio players.
  • ✓WMA enjoys broad native support across operating systems, browsers, and creative tools alike.
  • ✓WMA delivers impressive compression ratios, shrinking files dramatically while keeping visual quality high.
  • ✓You will find WMA support built into virtually every tool that handles Windows Media, legacy audio players — no plugins or converters needed.

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.

Common Use Cases for WMA to AU Conversion

  • Radio commercials
  • Guided meditation recordings
  • Audiovisual installation
  • Music education
  • Conference call recordings
  • Field recording preservation

Industry Applications

Audiobook PublishingMusic StreamingLive SoundForensic AudioMedical TranscriptionRadio Broadcasting

Best Practices for WMA to AU Conversion

  • →For WMA 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 WMA and AU formats in our detailed guide.

Troubleshooting WMA to AU Conversion

  • !AU audio quality degraded vs WMA → 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 WMA to AU conversion → some formats like AU may not support ID3 tags
  • !Volume changed after converting WMA to AU → normalize audio levels before conversion for consistent playback

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About WMA and AU

WMA

WMA (WMA audio) - Windows Media Audio, Microsoft audio format. Best for windows media, legacy audio players.

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 windows media, legacy audio players to legacy unix audio, sun workstation sound
File Size~Small to medium, similar to WAV after conversion

FAQs

Is converting WMA to AU free?

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

How long does it take to convert WMA to AU?

Most WMA 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 WMA to AU lose quality?

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

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

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

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