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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 WMA?

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

When Should You Use AU vs WMA?

Use AU When...

AU shines in legacy unix audio, sun workstation sound scenarios. The pixel-perfect output meets the demands of professional production environments.

Use WMA When...

Choose WMA for windows media, legacy audio players. It balances quality and file size better than most alternatives in its class.

AU vs WMA: Key Differences

  • •The core technical difference: AU relies on lossless compression whereas WMA uses lossy compression.
  • •Moving from AU (lossy) to WMA (lossy) means the output file will be significantly smaller — but at the cost of some visual fidelity.
  • •Alpha channel support: WMA lacks transparency support, so semi-transparent pixels from the source will be lost.
  • •File sizes: AU files typically range Small to medium, similar to WAV and WMA files Similar to MP3 at equivalent quality.
  • •Primary audience: AU is built for legacy unix audio, sun workstation sound scenarios, while WMA focuses on windows media, legacy audio players — 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 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.

Common Use Cases for AU to WMA 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 AU to WMA Conversion

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

Troubleshooting AU to WMA Conversion

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

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About AU and WMA

AU

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

WMA

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

Format Comparison

CompressionLossless → Lossy
TransparencyN/A
Use CaseConvert from legacy unix audio, sun workstation sound to windows media, legacy audio players
File Size~Similar to MP3 at equivalent quality after conversion

FAQs

Is converting AU to WMA free?

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

How long does it take to convert AU to WMA?

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

What is WMA best used for?

WMA is ideal for windows media, legacy audio players. Windows Media Audio, Microsoft audio format

Does converting AU to WMA lose quality?

Yes, converting AU to WMA uses lossy compression, which reduces file size by discarding some visual data. Set quality to 85-95% for a good balance of quality and file size.

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

WMA files are typically 50-80% smaller than AU files because WMA uses efficient lossy compression. The exact reduction depends on quality settings.

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