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Audiobooks are pieces of audio and silences (pauses, line breaks, etc..), where the encoder can save up some data; which it can use in pieces where there's more information (like pieces where a sentence is read). Audio books are often read in 44kHz mono formats, and CBR only handles this well at 64-80kbps. ABR and VBR can go much lower in bitrate than CBR. While VBR is more dynamic, ABR is more controlled. The question is, if a voice recording needs a lot of dynamic bitrate settings, or not, since it's only one 'instrument' playing at a time (unlike with music, where multiple instruments are playing at a variety of rhythms). In places of silence, (comma, period, line break,...), the silence is compressed, saving up lots of data, and making the end file smaller in size.

Talk about ABR vs VBR for audio books, and low bitrates. — Preceding unsigned comment added by 174.140.111.29 ( talk) 00:36, 6 June 2018 (UTC) reply