A low pitched bark indicates aggression and is possibly a threat.

低声调的吠叫意味着狗狗挑衅，可能也是一种威胁。

youdao

With a low-pitched rumbling noise, the propeller began to rotate.

随着低沉的隆隆声，螺旋桨开始旋转起来。

《柯林斯英汉双解大词典》

The song was pitched too low for my voice.

这首歌起调太低，不适合我的嗓音。

《牛津词典》

The species had its best breeding season for 130 years last year, measured by the number of "booming" males, whose distinctive mating call is a low-pitched, far-carrying "boom".

BBC: Rescued rare bird to be released

These are now being pitched to relatively low-brow customers.

ECONOMIST: Hedge funds

Those elements are traditionally performed by three instruments: a triangle, an accordion, and a zabumba, a drum pitched somewhere between a low snare and a small bass.

NPR: Northern Brazilian Tradition, New York Style