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Can't compare it to other Kobo devices (Sony PRS-T2 was completely silent), but my Libra H2O produces a slight but constant coil whine with lots of chirping when either WiFi is turned off and/or the lighting is not turned on fully. Turning pages, changing orientation, or closing the book makes no difference.
Luckily the noise tends to disappear from my hearing (unless strained) at about 15-20cm in a fairly quiet room (some background noise)... Still annoying though, going to try and find some showroom models soon to see if they also have it (or if it's just my tinnitus acting up and making me extra sensitive). If they don't I'll see about exchanging mine (still have about one week trial period left).
Since Coil whine is something physical, I'm doubting changing settings (aside from turning hardware on/off) will make much difference.
Anyway, for me the solution was to:
- Turn up brightness to full... but can't really recommend it.
or
- Turn WiFi on, at the cost of some battery charge... not sure how much though.
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