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Interval information
Ratio 128/77
Factorization 27 × 7-1 × 11-1
Monzo [7 0 0 -1 -1
Size in cents 879.85615¢
Names keenanismic major sixth,
octave-reduced 77th subharmonic
Color name 1ur6, luru 6th
FJS name [math]\text{M6}_{7,11}[/math]
Special properties reduced
Tenney height (log2 nd) 13.2668
Weil height (log2 max(n, d)) 14
Wilson height (sopfr (nd)) 32
Harmonic entropy
(Shannon, [math]\sqrt{nd}[/math])
~3.93978 bits

[sound info]
open this interval in xen-calc

128/77, the keenanismic major sixth or octave-reduced 77th subharmonic, is an interval that is 385/384 (4.5 cents) flatter than 5/3. It is almost exactly 1/7th of a cent flatter than the 880 cent major sixth of 15edo.

See also