For the same reason that people who are hard of hearing often talk really loud, or even shout: people need to be able to hear *themselves* when talking. So while they are *trying* to actively keep their voice low, they still need to be able to hear it, which means they’re talking far louder than they think they are. My mother has partial deafness on her left side, and in places like the doctor’s waiting room when we’re talking quietly, she talks far louder than I do, and much louder than she thinks she does.
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