CONVERT
WV → SPX
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Fast, secure WV to SPX conversion. No registration required.
Why this pair exists — WV is WavPack's hybrid lossless/lossy audio codec with a correction-file workflow. Ergo, the SPX route. Turn your WV audio into a widely-supported SPX file. The conversion happens server-side through FFmpeg — the same engine behind every major audio editor — so the output plays cleanly on phones, car stereos, DJ software and streaming tools. In practice WV is WavPack's hybrid lossless/lossy audio codec with a correction-file workflow. On the other end, SPX is an audio format with specific trade-offs between file size, bitrate flexibility, and device support.
WavPack Audio
Source formatWavPack is an open-source audio codec that offers lossless, lossy, and hybrid compression modes. Its unique hybrid mode creates a lossy file plus a correction file that together reconstruct the original, enabling flexible storage strategies.
Speex Audio
Target 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.
Why convert WV to SPX
The motivation for a WV → SPX conversion is almost always practical: a playback device, hosting platform or editing suite that insists on SPX. The audio quality trade-off is controllable via bitrate; the compatibility win is immediate and unambiguous.
HOW TO CONVERT
WV → SPX
Give us the WV
Select a WV (or several for batch). We read the header to pick decoder settings automatically.
Re-encode to SPX
The audio is decoded, optionally resampled, and re-encoded as SPX at transparent default bitrate.
Retrieve your SPX
Grab the download as soon as it is ready. Typical jobs finish in seconds for short clips.
Common Use Cases
Share across platforms
Send SPX files to anyone without worrying about whether they have the right software for WV.
Embed in documents
Drop SPX output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
SPX often produces smaller files than WV 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.
WV vs SPX — Strengths and limitations
What each format does best, and where it falls short.
WV Strengths
- Hybrid lossy/lossless mode.
- Supports DSD, 32-bit float, multichannel.
- Competitive compression vs FLAC.
- Active maintenance since 1998.
Limitations
- Small ecosystem.
- Hybrid mode complexity.
- Hardware support limited vs FLAC.
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.
WV vs SPX — Technical specifications
Side-by-side comparison of the technical details.
WV
- MIME type
- audio/x-wavpack
- Extension
- .wv (main), .wvc (correction)
- Modes
- Lossless, Hybrid lossy+correction, 32-bit float
- License
- BSD-style
SPX
- MIME type
- audio/speex
- Extension
- .spx
- Modes
- Narrowband/Wideband/Ultra-wideband
- Container
- Ogg
- Successor
- Opus
| Specification | WV | SPX |
|---|---|---|
| MIME type | audio/x-wavpack | audio/speex |
| Extension | .wv (main), .wvc (correction) | .spx |
| Modes | Lossless, Hybrid lossy+correction, 32-bit float | Narrowband/Wideband/Ultra-wideband |
| License | BSD-style | — |
| Container | — | Ogg |
| Successor | — | Opus |
WV vs SPX — Typical file sizes
Approximate file sizes for common scenarios.
WV
- 3-min song (CD lossless) 18-24 MB
- 3-min hi-res 24/96 60-90 MB
SPX
- 1 min voice (wideband 24 kbps) ~180 KB
Quality & Compatibility
The SPX output is as good as the WV source allows. If the WV was encoded at 96 kbps, the SPX cannot reconstruct detail the encoder already dropped; picking a very high SPX bitrate just produces a larger file. Match SPX bitrate to the WV quality for the best balance.
Tips for Best Results
- Sample-rate mismatches between WV and target device (48 kHz phone output from a 44.1 kHz track) are handled automatically; no manual resampling needed.
- For audiobook delivery, match the platform spec exactly — ACX requires 192 kbps CBR 44.1 kHz stereo, for example.
- Batch-convert an album in one job so every track shares identical encoder settings and loudness normalisation.
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 SPX 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 WV container to the SPX container automatically where both formats support them. If a tag field has no SPX equivalent, it is dropped silently. Use any tag editor (Mp3tag, MusicBrainz Picard) to fine-tune afterwards.
RELATED CONVERSIONS
Other popular pairs involving WV or SPX
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Related comparisons
See these formats side by side to understand which fits your use case best.
Secure & Private Conversion
Your files are encrypted during transfer, processed in isolated containers, and automatically deleted within 60 minutes. We never read, share, or store your data.