# 81/80 equal-step tuning

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**81/80s equal temperament** (AS81/80) is an equal multiplication of the syntonic comma. It corresponds to 55.79763 EDO.

## Theory

81/80s equal temperament can be regarded as a subset of 5-limit just intonation.

Some intervals it approximates well are 5/4, 7/4, 12/11, 14/13, and 15/11. In addition, it represents well certain compound intervals such as 8/3, 11/1, 12/1 while omitting their octave reductions.

With a stretch, 53edo can be regarded as its ED2 equivalent.

Harmonic | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | |
---|---|---|---|---|---|---|---|---|---|---|---|---|

Error | absolute (¢) | +4.35 | -9.40 | +8.70 | +9.50 | -5.05 | +7.66 | -8.45 | +2.70 | -7.65 | -0.60 | -0.70 |

relative (%) | +20 | -44 | +40 | +44 | -23 | +36 | -39 | +13 | -36 | -3 | -3 | |

Step | 56 | 88 | 112 | 130 | 144 | 157 | 167 | 177 | 185 | 193 | 200 |