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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.

What is 3GA?

3GA (audio/3gpp) uses lossy compression optimized for mobile voice recordings, phone memos. 3GPP Audio, compressed audio from mobile phone recordings

When Should You Use SPX vs 3GA?

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.

Use 3GA When...

Reach for 3GA when your priority is mobile voice recordings, phone memos — its efficient compression makes sharing fast and storage minimal.

SPX vs 3GA: Key Differences

  • •SPX and 3GA diverge on compression: lossy compression for the source, lossy compression for the target.
  • •Both formats share lossy compression, so quality behavior is similar across the two — file size differences come from algorithm efficiency rather than compression philosophy.
  • •Alpha channel support: 3GA handles transparency.
  • •Storage footprint: varies for SPX vs varies for 3GA.
  • •Use case fit: SPX targets voip telephony, voice chat, speech compression and 3GA targets mobile voice recordings, phone memos — your choice depends on which workflow stage you are serving.

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.

Advantages of 3GA

  • ✓3GA uses lossy compression tailored for Mobile voice recordings, phone memos.
  • ✓3GA is supported natively on virtually every device, browser, and operating system.
  • ✓3GA files are compact and quick to transfer, even over slow connections.
  • ✓3GA integrates seamlessly with all major creative tools and workflows.

Common Use Cases for SPX to 3GA Conversion

  • Sound design
  • Language learning
  • Professional broadcasting
  • Video game audio assets
  • Film soundtracks
  • Radio commercials

Industry Applications

AccessibilityVoice-overAudio ArchivingGame AudioFilm Post-productionAudiobook Publishing

Best Practices for SPX to 3GA Conversion

  • →Converting SPX to 3GA: 3GA preserves full audio fidelity — ideal for archiving master recordings
  • →Normalize audio levels before conversion for consistent playback volume
  • →3GA excels in professional audio workflows
  • →Always keep a backup of your original files before converting
  • →Choose the appropriate quality settings for your specific use case

Related Article

Video Compression Guide: Reduce File Size Without Losing Quality

Learn more about SPX and 3GA formats in our detailed guide.

Troubleshooting SPX to 3GA Conversion

  • !Clicks or pops in the converted 3GA → sample rate conversion can introduce artifacts; use a clean multiple of the source rate
  • !3GA file has silence at the beginning or end → trim the source SPX file before converting to avoid unnecessary padding
  • !Stereo image collapsed after converting SPX to 3GA → verify that the converter preserves channel mapping for multichannel audio
  • !The converted 3GA clips or distorts at peaks → reduce the gain or apply a limiter before conversion to prevent hard clipping

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About SPX and 3GA

SPX

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

3GA

3GA (3GA) - 3GPP Audio, compressed audio from mobile phone recordings. Ideal for mobile voice recordings, phone memos.

Format Comparison

CompressionLossy → Lossy
TransparencyN/A
Use CaseConvert from voip telephony, voice chat, speech compression to mobile voice recordings, phone memos
File Size~Standard file sizes after conversion

FAQs

Is converting SPX to 3GA free?

Yes, GoConvertFile offers free conversion of SPX to 3GA for files up to 100MB. No registration required.

How long does it take to convert SPX to 3GA?

Most SPX to 3GA conversions complete within seconds for standard-sized files. Larger files may take longer depending on the conversion complexity.

What is 3GA best used for?

3GA is ideal for mobile voice recordings, phone memos. 3GPP Audio, compressed audio from mobile phone recordings

What file size should I expect after converting SPX to 3GA?

File size after SPX to 3GA conversion depends on the content complexity and quality settings. Both formats use similar compression approaches so sizes are comparable.

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