Well, they hear the Natsuhi shot in ep1... and that's about all I can think of in terms of gunshot noises :/.
She was just in the next room though.
Come to think of it, lack of noise in general is a problem for a lot of the killings. Kumasawa's scream when she finds Kanon in the boiler room is heard quite some way away, but wouldn't you expect, say, Eva to scream when someone advances on her with a stake?
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