the.com/earshot

means the distance within which a sound, especially a voice, can be heard.

from A compound of "ear" and "shot" — "shot" here in its old sense of the range or distance something can travel, the same notion behind "bowshot," the distance an arrow flies. So earshot is, quite literally, how far your voice 'shoots' before it falls out of hearing. It dates to around the early 17th century and likely takes after that older "bowshot," trading the arrow's flight for the carry of sound.