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.
Core Audio Format (CAF) is Apple's audio container designed to overcome the file size and sample rate limitations of AIFF and WAV.
Reach for SPX when your priority is voip telephony, voice chat, speech compression — its efficient compression makes sharing fast and storage minimal.
Reach for CAF when your priority is apple audio production, professional editing — its uncompromising quality ensures every detail is preserved.
Learn more about SPX and CAF formats in our detailed guide.
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SPX (SPX) - Speex, open-source speech codec for VoIP and voice. Best for voip telephony, voice chat, speech compression.
CAF (CAF audio) - Core Audio Format, Apple's professional audio format. Ideal for apple audio production, professional editing.
Yes, GoConvertFile offers free conversion of SPX to CAF for files up to 100MB. No registration required.
Most SPX to CAF conversions complete within seconds for standard-sized files. Larger files may take longer depending on the conversion complexity.
CAF is ideal for apple audio production, professional editing. Core Audio Format, Apple's professional audio format
No, converting SPX to CAF does not cause additional quality loss — CAF uses lossless compression. However, any artifacts already present in the original SPX file will persist in the CAF output.
CAF files are typically 2-5x larger than equivalent SPX files because CAF preserves all pixel data. This is expected and necessary for lossless quality.