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What is ALAC?

Apple Lossless Audio Codec (ALAC) provides lossless compression for Apple Music and iTunes libraries without compromising audio quality.

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 ALAC vs AU?

Use ALAC When...

Reach for ALAC when your priority is apple ecosystem lossless audio, itunes library — its uncompromising quality ensures every detail is preserved.

Use AU When...

Reach for AU when your priority is legacy unix audio, sun workstation sound — its uncompromising quality ensures every detail is preserved.

ALAC vs AU: Key Differences

  • •ALAC and AU diverge on compression: lossless compression for the source, lossless compression for the target.
  • •Since both ALAC and AU use lossless compression, the quality characteristics are comparable — differences in file size come down to how efficiently each format implements compression.
  • •Alpha channel support: AU lacks transparency support.
  • •ALAC files are typically 40-60% of original WAV size while AU files range Small to medium, similar to WAV
  • •ALAC is optimized for apple ecosystem lossless audio, itunes library while AU is designed for legacy unix audio, sun workstation sound — choose based on your specific workflow needs

Advantages of ALAC

  • ✓ALAC applies lossless compression specifically calibrated for Apple ecosystem lossless audio, iTunes library.
  • ✓ALAC enjoys broad native support across operating systems, browsers, and creative tools alike.
  • ✓ALAC guarantees every bit of the original data survives — no approximations, no shortcuts.
  • ✓You will find ALAC support built into virtually every tool that handles Apple ecosystem lossless audio, iTunes library — 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 ALAC to AU Conversion

  • Audiovisual installation
  • Music education
  • Conference call recordings
  • Field recording preservation
  • Music production and mixing
  • Podcast distribution

Industry Applications

Live SoundForensic AudioMedical TranscriptionRadio BroadcastingMusic ProductionPodcasting

Best Practices for ALAC to AU Conversion

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

Troubleshooting ALAC to AU Conversion

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

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About ALAC and AU

ALAC

ALAC (ALAC audio) - Apple Lossless Audio Codec, lossless audio for iTunes/Apple Music. Best for apple ecosystem lossless audio, itunes library.

AU

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

Format Comparison

CompressionLossless → Lossless
TransparencySupported
Use CaseConvert from apple ecosystem lossless audio, itunes library to legacy unix audio, sun workstation sound
File Size~Small to medium, similar to WAV after conversion

FAQs

Is converting ALAC to AU free?

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

How long does it take to convert ALAC to AU?

Most ALAC 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

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

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

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