low pitch ,
low frequency

This means that they use high and low pitches to help make differences in meaning clear.

As hearing gets worse, it may become difficult to hear sounds at lower pitches.

A slightly lower pitch would have been better, but it could still fall within this man's spectrum.

Despite the low pitch of her voice, Quentin heard every word she spoke.

So England have made 225, which is not a disaster on a tough, low pitch.

In 1867, the batter was given the right to call for a high or low pitch.

"Girls with a lower pitch have a struggle when they come here to work at first," she said.

Then he struck out, missing at a pitch low and away.

The voice falls during the word(s) from a high to a very low pitch.

It might help the pitchers a little bit, maybe, with the low pitch.