6561/6400
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Ratio
6561/6400
Factorization
2-8 × 38 × 5-2
Monzo
[-8 8 -2⟩
Size in cents
43.01258¢
Name
double syntonic comma
Color name
lagugu unison, Lgg1
FJS name
[math]\text{P1}_{5,5}[/math]
Special properties
reduced
Tenney height (log2 nd)
25.3236
Weil height (log2 max(n, d))
25.3594
Wilson height (sopfr(nd))
50
Harmonic entropy
(Shannon, [math]\sqrt{nd}[/math])
~4.51245 bits
[sound info]
open this interval in xen-calc
| Interval information |
(Shannon, [math]\sqrt{nd}[/math])
[sound info]
6561/6400, the double syntonic comma, is equal to two 81/80's stacked or (81/80)2.
Sagittal notation
In the Sagittal system, the downward version of this comma (possibly tempered) is represented by the sagittal and is called the 25 small diesis, or 25S for short, because the simplest interval it notates is 25/1 = 5×5 (equiv. 25/16), as for example in E -B . The upward version is called 1/25S or 25S up and is represented by .