M4A vs SPX
A detailed comparison of M4A Audio and Speex Audio — file size, quality, compatibility, and which format to choose for your workflow.
M4A Audio
Audio FilesM4A is an MPEG-4 audio container typically containing AAC or ALAC encoded audio. It is the standard format for iTunes purchases and Apple Music downloads.
About M4A filesSpeex Audio
Audio FilesSpeex is an open-source audio compression format specifically designed for speech encoding. It uses Code-Excited Linear Prediction (CELP) and supports narrowband, wideband, and ultra-wideband modes for different speech quality requirements.
About SPX filesStrengths Comparison
M4A Strengths
- Superior audio quality to MP3 at the same bitrate (AAC codec).
- Native support across Apple, iOS, Android, and Windows.
- Carries rich metadata: album art, chapters, lyrics, podcast bookmarks.
- Same container as MP4 — tooling overlaps with video workflows.
- Lossless variant (ALAC inside M4A) for audiophile archiving.
SPX Strengths
- Patent-free voice codec.
- Three sample-rate modes for voice.
- Low CPU decode.
Limitations
M4A Limitations
- AAC patents still active in some jurisdictions — licensing fees apply for encoders.
- Seeking in variable-bitrate M4As can drift without an index atom.
- Less universal than MP3 on older hardware (pre-2010 car stereos, cheap MP3 players).
- Container overhead is larger than a raw ADTS AAC stream.
SPX Limitations
- Deprecated in favor of Opus.
- No music support.
- Rarely used in new projects.
Technical Specifications
| Specification | M4A | SPX |
|---|---|---|
| MIME type | audio/mp4 | audio/speex |
| Extension | .m4a (and .m4b for audiobooks, .m4p for legacy DRM) | .spx |
| Container | ISO Base Media File Format (ISOBMFF) | Ogg |
| Codecs | AAC-LC, HE-AAC, ALAC | — |
| Max sample rate | 96 kHz | — |
| Modes | — | Narrowband/Wideband/Ultra-wideband |
| Successor | — | Opus |
Typical File Sizes
M4A
- 4-minute song (AAC 128 kbps) 4-5 MB
- 4-minute song (AAC 256 kbps) 8-10 MB
- 1-hour podcast (64 kbps) 28 MB
- 4-minute song (Apple Lossless) 25-35 MB
SPX
- 1 min voice (wideband 24 kbps) ~180 KB
Ready to convert?
Convert between M4A and SPX online, free, and without installing anything. Encrypted upload, automatic deletion after 2 hours.
Frequently Asked Questions
M4A (MPEG-4 Audio) is an audio-only variant of the MP4 container, popularized by Apple in 2004 with the iTunes Store. Inside the .m4a wrapper is typically AAC (lossy) or Apple Lossless (ALAC) audio. The same container holds video when renamed .mp4 — only the track contents differ.
M4A files play on every Apple device natively, Windows Media Player, VLC, foobar2000, and most modern media players. Android supports M4A since version 2.0. On older car stereos and MP3 players, convert M4A to MP3 first — KaijuConverter does this in one click.
Use KaijuConverter's M4A-to-MP3 converter, or iTunes (File → Convert → Create MP3 Version). Free tools like Audacity, fre:ac, and ffmpeg also work. Note that converting lossy M4A (AAC) to lossy MP3 double-compresses — for best quality, use a higher MP3 bitrate (192 kbps or more).
M4A (AAC inside) sounds measurably better than MP3 at the same bitrate — AAC at 128 kbps is roughly equivalent to MP3 at 192 kbps. Use M4A when your target devices support it (every modern phone and OS); use MP3 for maximum compatibility with legacy hardware.
Older M4A files from the iTunes Store (before 2009) were DRM-protected — those .m4p files only play on authorized devices. Modern M4A is DRM-free. If an M4A refuses to play, check if it's actually ALAC (Apple Lossless) — some players only handle AAC inside M4A containers.
They share the same container format, but M4A holds only audio tracks while MP4 holds video (with or without audio). Renaming .m4a to .mp4 usually still plays fine — most players detect content by internal track metadata, not file extension.