Thread: Audible moving to Enhanced Format ONLY
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Old 05-27-2020, 05:24 AM   #9
murraypaul
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Join Date: Jun 2008
Device: Note 4, Kobo One
A quick Google suggests that:
- Format 4 is fixed at 32kb/s, 22kHz, mono, while enhanced is more flexible, with 32-128kb/s, 22 or 44kHz, mono or stereo. (In practice seems to be 64kb/s, 22kHz)
- Enhanced is AAC, Format 4 is MP3
- Enhanced generally uses twice as much space.

Some detail here: https://audible.custhelp.com/app/ans...st-suits-me%3F
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