‘Throaty’ or pinched tones are tones which are trying to force themselves through a half-closed throat blocked either by…

Luiza Terazzini

… insufficient opening of the larynx or by stoppage of the throat passage, due to the root of the tongue being forced down and back too hard or possibly to a low, soft palate.
In order to have the throat perfectly open it is necessary to have the jaw absolutely relaxed.

Luisa Tetrazzini, one of the great coloratura sopranos of the late 19th and early 20th century