24-Bit FLAC vs 320kbps MP3: Audiophile Preservation vs Practical Portability
How bit-for-bit lossless FLAC compression differs from psychoacoustic MP3 encoding for archival and music production.
Audio Codecs•5 min read•2026-10-28
1. Psychoacoustic Masking (MP3 320kbps) vs Bit-Identical Prediction (FLAC)
MPEG-1 Audio Layer III (MP3) at 320 kbps Constant Bitrate (CBR) represents the ceiling of lossy perceptual encoding. By applying psychoacoustic models, it discards frequencies above 20 kHz and quiet harmonic details masked by louder transients, reducing file size by roughly 75% compared to uncompressed PCM.
Free Lossless Audio Codec (FLAC), conversely, uses linear predictive coding and run-length encoding to compress audio by 40% to 50% with zero information loss. Every decoded sample is mathematically bit-identical to the original studio master.
Key Engineering Takeaways
- Use 320kbps MP3 for podcasts, keynote speeches, car audio, and mobile playlists (~2.4 MB per minute).
- Use 24-bit FLAC for archival preservation, Foley sound design, and DAW stem remixing (~10.5 MB per minute).