This is the 1565th most frequent Korean word.
낮게
"낮게" means "low" or "in a low manner."
Here, '낮게' is used as an adverb to describe the manner in which his voice was perceived, indicating its low pitch.
그의 목소리가 낮게 들렸다.
His voice sounded low.
In this sentence, '낮게' modifies the verb '설정하다'(set) to indicate that the setting should be done to a lower level.
온도를 이 방에서 더 낮게 설정하세요.
Please set the temperature lower in this room.
Here, '낮게' is illustrating the altitude level that the airplane flew, emphasizing it was below the clouds.