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648.68206 cents
sound sample

In 11-limit Just Intonation, 16/11 is an undecimal subfifth measuring about 648.7¢. It is the inversion of 11/8, the undecimal superfourth. While the name suggests some variation of a perfect fifth, the subfifth is generally considered an interval in it's own right being like neither a perfect fifth nor the tritone. The character is something very unique in that it produces a sound of overtones that resembles that of a large bell.

See: Gallery of Just Intervals