"You're talking too softly, I'm going to turn up your volume," which is like having a coworker walk up to you and say, "You're speaking too softly, I'm going to turn up your face."
좀 키워야겠어. "라고 합니다. 그런데, 직장 동료가 여러분에게 와서 "네 말소리가 너무 작은데. 얼굴을 좀 높여야겠어" 이렇게는 말하지 않겠죠.