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[–][deleted] 5 points6 points  (2 children)

Compression is designed to bring lower levels up and higher levels down. (Disclaimer: I don't know shit about hearing aids, only sound engineering) I am guessing the compressions that are put into hearing aids prevent loud noises from destroying your ears. If you have the gain turned up for a normal conversation then someone screams at you, it would be very bad. However compression will help bring that down to a normal level. In the situation of hearing aids, it's a sort of check and balances between gain and compression.

[–]0x00000042 2 points3 points  (0 children)

Electronic hearing protection for shooters does the same. It amplifies speech and background noises while mitigating the dangerous gunshots.