622edo
| ← 621edo | 622edo | 623edo → |
622 equal divisions of the octave (abbreviated 622edo or 622ed2), also called 622-tone equal temperament (622tet) or 622 equal temperament (622et) when viewed under a regular temperament perspective, is the tuning system that divides the octave into 622 equal parts of about 1.93 ¢ each. Each step represents a frequency ratio of 21/622, or the 622nd root of 2.
622edo is enfactored in the 41-limit, having the same tuning as the highly notable 311edo. In that regard, 622edo is a compound of two 311edos that don't intersect, and provides barely anything new apart from most characteristics of what it doubles.
622edo has potential as an add-43 system, correcting the 311edo's mapping for 43, which is the first harmonic not represented consistently by 311edo. Some 43-limit commas it tempers out are 1849/1848, 50000/49923, 59168/59049, 300125/299538, 6837602/6834375, 1048576/1048383.
Prime harmonics
| Harmonic | 2 | 3 | 5 | 7 | 11 | 13 | 17 | 19 | 23 | 29 | 31 | 37 | 41 | 43 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Error | absolute (¢) | +0.000 | +0.296 | -0.462 | -0.337 | +0.451 | +0.630 | -0.775 | -0.407 | +0.665 | +0.648 | +0.945 | -0.540 | -0.767 | -0.264 |
| relative (%) | +0 | +15 | -24 | -17 | +23 | +33 | -40 | -21 | +34 | +34 | +49 | -28 | -40 | -14 | |
| Steps (reduced) |
622 (0) |
986 (364) |
1444 (200) |
1746 (502) |
2152 (286) |
2302 (436) |
2542 (54) |
2642 (154) |
2814 (326) |
3022 (534) |
3082 (594) |
3240 (130) |
3332 (222) |
3375 (265) | |