Understanding the 24-bit / 96 kHz specification used for high-quality archival audio capture.
What does 24-bit mean?
24-bit describes the word length used for each digital audio sample and provides substantially greater theoretical dynamic range than 16-bit.
What does 96 kHz mean?
96 kHz means the system captures 96,000 samples per second. It provides a higher sampling rate than CD audio's 44.1 kHz and the 48 kHz minimum recommended by IASA for analogue transfers.
Why use 24-bit 96 kHz?
IASA identifies 96 kHz as a higher sampling rate that may be advantageous for many content types and recommends at least 24-bit for analogue materials.
Is this suitable for every recording?
It is a strong preservation specification for many analogue audio projects, but the exact requirements should be agreed according to source material and project objectives.
What files are normally produced?
A preservation master can be supplied as WAV or BWF WAV. Smaller access files can be created separately where required.
Why not just use MP3?
MP3 is a lossy compressed format. It is useful for access and distribution but does not preserve the full captured waveform in the same way as an uncompressed PCM master.
Frequently Asked Questions
Is 24-bit 96 kHz better than CD quality?
It provides higher bit depth and sampling rate than the 16-bit/44.1 kHz CD standard and is commonly used for higher-quality preservation capture.
Is 96 kHz required by all archives?
No. Specifications vary. IASA recommends at least 48 kHz and 24-bit for analogue material, with 96 kHz as a higher-rate guide.
Does 24-bit 96 kHz make the source perfect?
No. Source condition and the complete playback and conversion chain remain critical.
Further Reading
Oxford Duplication Centre — Practical Expertise
Audio preservation depends on the original carrier, compatible playback equipment, a controlled signal path and careful quality assurance. The preservation master should retain the best practical representation of the source, with access files created separately.
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