CONVERT
SPX → TTA
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Fast, secure SPX to TTA conversion. No registration required.
Opening note — SPX is an audio format with specific trade-offs between file size, bitrate flexibility, and device support. The TTA you want is two clicks away. Need a TTA version of a SPX recording for a podcast host, audio book platform or DAW that refuses the original container? Drop the file above and our encoder produces a clean TTA you can drag straight into the destination tool. Metadata such as title, artist and cover art travels with the audio. Context: SPX is an audio format with specific trade-offs between file size, bitrate flexibility, and device support. TTA is the True Audio lossless codec, fast to decode on low-power devices.
Speex Audio
Source formatSpeex 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.
True Audio Lossless
Target formatTTA (True Audio) is an open-source lossless audio codec that provides real-time lossless compression with hardware-friendly decoding. It achieves compression ratios similar to FLAC while maintaining very low CPU requirements during playback.
Why convert SPX to TTA
Speex Audio is great in its own niche, but True Audio Lossless is either more universally playable or better suited to the device you are targeting. Converting lets you ship the audio without asking listeners to install a codec. The loss in quality between the two is negligible at sensible bitrates.
HOW TO CONVERT
SPX → TTA
Upload the SPX
Drop or select your SPX file. The upload is encrypted and the file is queued for conversion.
Transcode via FFmpeg
FFmpeg decodes the SPX stream to PCM internally, then re-encodes as TTA at the bitrate you select.
Download the TTA
The TTA is delivered as a direct download; metadata and cover art transfer automatically where possible.
Common Use Cases
Share across platforms
Send TTA files to anyone without worrying about whether they have the right software for SPX.
Embed in documents
Drop TTA output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
TTA often produces smaller files than SPX for web, email and storage.
Archive & future-proof
Store in a widely-supported format that will still open on future operating systems without legacy plugins.
SPX vs TTA — Strengths and limitations
What each format does best, and where it falls short.
SPX Strengths
- Patent-free voice codec.
- Three sample-rate modes for voice.
- Low CPU decode.
Limitations
- Deprecated in favor of Opus.
- No music support.
- Rarely used in new projects.
TTA Strengths
- Lossless bit-exact reproduction.
- Fast, low-memory decoding.
- Open-source reference.
- Cue-sheet support.
Limitations
- Compression ratio worse than FLAC.
- Niche tooling.
- Hardware support died with 2000s DAP era.
SPX vs TTA — Technical specifications
Side-by-side comparison of the technical details.
SPX
- MIME type
- audio/speex
- Extension
- .spx
- Container
- Ogg
- Modes
- Narrowband/Wideband/Ultra-wideband
- Successor
- Opus
TTA
- MIME type
- audio/x-tta
- Extension
- .tta
- Algorithm
- Fixed prediction + adaptive Rice coding
- License
- LGPL
| Specification | SPX | TTA |
|---|---|---|
| MIME type | audio/speex | audio/x-tta |
| Extension | .spx | .tta |
| Container | Ogg | — |
| Modes | Narrowband/Wideband/Ultra-wideband | — |
| Successor | Opus | — |
| Algorithm | — | Fixed prediction + adaptive Rice coding |
| License | — | LGPL |
SPX vs TTA — Typical file sizes
Approximate file sizes for common scenarios.
SPX
- 1 min voice (wideband 24 kbps) ~180 KB
TTA
- 3-min song (CD) 20-25 MB
- Full CD album 250-350 MB
Quality & Compatibility
Lossy-to-lossy transcoding (most cross-format audio jobs) loses a tiny amount of quality on each pass — usually inaudible at our default VBR ~190 kbps for music or 96 kbps for speech. Lossy-to-lossless conversions freeze the existing quality but cannot improve it; lossless-to-lossy is only as good as the target bitrate you choose.
Tips for Best Results
- Pick 128 kbps for podcasts and voice, 192–256 kbps for music, 320 kbps only if the audio will be edited further downstream.
- Keep the SPX master alongside the TTA — re-encoding a lossy format twice accumulates audible artefacts.
- For mono voice content, convert to mono TTA explicitly to halve file size without any quality loss.
Frequently Asked Questions
Lossy-to-lossy conversions (most combinations) re-compress the audio, which technically introduces some loss. At a 192 kbps or higher target it is inaudible on normal equipment. Lossy-to-lossless conversions freeze the existing quality but cannot improve it; lossless-to-lossy transcodes are only as good as the target bitrate you choose.
For voice content (podcasts, audiobooks, lectures) 128 kbps is indistinguishable from higher bitrates. For music, 192-256 kbps covers most listening; 320 kbps is the ceiling for TTA and the right choice for audio you plan to edit further. Above that, prefer a lossless target instead.
Yes. Title, artist, album, year and cover art travel from the SPX container to the TTA container automatically where both formats support them. If a tag field has no TTA equivalent, it is dropped silently. Use any tag editor (Mp3tag, MusicBrainz Picard) to fine-tune afterwards.
RELATED CONVERSIONS
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Related comparisons
See these formats side by side to understand which fits your use case best.
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