Listed only by Irwin, who says: A Foundation stop of octave 4' pitch on the manuals, and sometimes 8' on the pedals. It is voiced to extend upward all of the louder Diapasons, such as the Diapason Magna, Stentor Diapason, and Grand Diapason, whether of chorus or solo voicing. Its voice is also a source of brilliance to the Chorus Reeds, like the Tuba Magna and Trumpet, giving them a natural train of harmonics, starting at the octave pitch. According to Greek legend, Stentor was a herald in the Trojan war, described by Homer as having a voice as loud as fifty men.

Stentor Octave 4', Solo, Fanfare; Convention Hall, Atlantic City, New Jersey, USA; Midmer-Losh 1929-32. This is the only known example.