If you're using a high-end bluetooth headset on your Macbook Pro it's likely your mac is using an audio codec which favors battery efficiency over high quality. This results in a drastic degradation of sound, the SBC codec is the likely culprit, read more about it here.
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iBooks EPUBs actually show up on macOS as folders. If you need the actual file you can use the above script to convert your iBook directory of files to a destination directory.
The path of iBook files as of macOS 10.15.7 is:
/Users/${USER}/Library/Mobile Documents/iCloud~com~apple~iBooks/Documents