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Either I'm getting old and deaf or my unit does not do this. I turned my KA1 on to see if I could tell a difference between it and my Libra H20 and I got nothing. I always leave wifi off and usually have the light on about 10% for night reading. I haven't noticed any hums. I have noticed that some books cause the reader to wake from sleep more slowly than others, but that's all.
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