4/1
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| Ratio | 4/1 |
| Factorization | 22 |
| Monzo | [2⟩ |
| Size in cents | 2400¢ |
| Names | 4th harmonic, double octave, fifteenth, tetrave |
| Color name | wa 15th |
| FJS name | [math]\text{P15}[/math] |
| Special properties | harmonic |
| Tenney height (log2 nd) | 2 |
| Weil height (log2 max(n, d)) | 4 |
| Wilson height (sopfr (nd)) | 4 |
| Harmonic entropy (Shannon, [math]\sqrt{n\cdot d}[/math]) |
~3.85323 bits |
[sound info] | |
| open this interval in xen-calc | |
4/1 is the 4th harmonic, double octave, fifteenth, or the tetrave. It is equal to a stack of two octaves: (2/1)2.
It is the equivalence interval of the meansquared temperament.
See also
- Ed4 – Equal divisions of the 4th harmonic