There are various issues created by legislated volume levels in some countries:
1) Earphones/buds/headsets vary dramatically in sensitivity so imposed limits and lack of ability to turn volume louder creates a problem.
2) Some makers simply limit the gain. This is set assuming typical modern over compressed music mixes.
3) Some makers monitor program level and limit what you can turn it up to, this shouldn't affect audio books. However issue (1) means that it can be too low.
4) Some may soft limit level, this shouldn't affect audio books but might and it takes no account of (1).
5) You may already have impaired hearing, perhaps due to past infection or age, not excessive noise. You need a higher level.
I'm all for safety and banning certain things, but the recommendations and limits on audio playback are broken. I had one French make PMP that was only any use to feed Car Stereo or HiFi in 2006.
Try different app (if DRM allows). Try different make and style of ’phones, avoid Bluetooth, and some €12 wired are better than €120 models.
Try a different player, especially not big brand.
Large 1990s not on ear but ear inside surround are often much louder and better quality.
I use Musicolet Android app for audiobooks and music. I've only one set of wired earbuds loud enough but four larger headphones are OK, one is from 1946!
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