lowThose notes are too low for me.
low-pitchedThe low-pitched rumble of the train shook the house.
gutturalArabic contains guttural sounds that are difficult for non-Arabic speakers to say properly.
throatyShe gave a loud, throaty laugh.
huskyShe's got a husky voice and is always cast as the romantic lead because of it.
gruffHis loud, gruff voice frightened the neighbourhood children.
sonorousHis sonorous voice rang through the halls.
bassThe bass part is quite difficult to sing.