Blog/post/audiobooks-sound-quality-vs-codec
From happytrees.org
These are some encoding settings I've tested for encoding audiobooks The source is Audible Enhanced Audio (.aax), 63kbit/s, 44.10 kHz, MPEG-4 Part 14(aac)
| Codec | bitrate | bandwidth | quality |
|---|---|---|---|
| mp3 | 32k | 16k | muffled* |
| mp3 | 32k | 22.05k | muffled* |
| mp3 | 48k | 22.05k | slightly muffled* |
| mp3 | 56k | 22.05k | hard to tell if any difference |
| mp3 | 64k | 22.0.5k | no detectable difference |
| m4b/aac | 32k | 16k | very bad |
| m4b/aac | 32k | 22.05k | very bad |
| m4b/aac | 64k | 44.1k | essentially same as source |
| opus | 32k | 22.05k | hard to tell if any difference |
- muffled* but words easily distinguished