low-pitched

The low-pitched voices continued in what I thought was a dispute.

Nay, he dared not even think of his gloomy, low-pitched, cramped room with its single window and repulsive furniture.

He paused in his low-pitched confidence to the blinking, sympathising dog.

Then Connie's voice, soft and low-pitched in the silence of the book-lined room, came to her as from a great distance.