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What is CAF?

Core Audio Format (CAF) is Apple's audio container designed to overcome the file size and sample rate limitations of AIFF and WAV.

What is SPX?

SPX files are built around lossy compression. Designed for voip telephony, voice chat, speech compression, they use the audio/speex MIME type and typically range from varies by content.

When Should You Use CAF vs SPX?

Use CAF When...

Reach for CAF when your priority is apple audio production, professional editing — its uncompromising quality ensures every detail is preserved.

Use SPX When...

Reach for SPX when your priority is voip telephony, voice chat, speech compression — its efficient compression makes sharing fast and storage minimal.

CAF vs SPX: Key Differences

  • •The core technical difference: CAF relies on lossless compression whereas SPX uses lossy compression.
  • •Moving from CAF (lossy) to SPX (lossy) means the output file will be significantly smaller — but at the cost of some visual fidelity.
  • •How transparency is handled: SPX does not support alpha channels — transparent areas in the source will become opaque.
  • •File sizes: CAF files typically range Flexible, supports very large files and SPX files N/A.
  • •CAF is optimized for apple audio production, professional editing while SPX is designed for voip telephony, voice chat, speech compression — choose based on your specific workflow needs

Advantages of CAF

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

Advantages of SPX

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

Common Use Cases for CAF to SPX 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 CAF to SPX Conversion

  • →For CAF to SPX: 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
  • →SPX 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 CAF and SPX formats in our detailed guide.

Troubleshooting CAF to SPX Conversion

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

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About CAF and SPX

CAF

CAF (CAF audio) - Core Audio Format, Apple's professional audio format. Best for apple audio production, professional editing.

SPX

SPX (SPX) - Speex, open-source speech codec for VoIP and voice. Ideal for voip telephony, voice chat, speech compression.

Format Comparison

CompressionLossless → Lossy
TransparencyN/A
Use CaseConvert from apple audio production, professional editing to voip telephony, voice chat, speech compression
File Size~Standard file sizes after conversion

FAQs

Is converting CAF to SPX free?

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

How long does it take to convert CAF to SPX?

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

What is SPX best used for?

SPX is ideal for voip telephony, voice chat, speech compression. Speex, open-source speech codec for VoIP and voice

Does converting CAF to SPX lose quality?

Yes, converting CAF to SPX 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 CAF to SPX?

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

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