1330edo
| ← 1329edo | 1330edo | 1331edo → |
1330 equal divisions of the octave (abbreviated 1330edo or 1330ed2), also called 1330-tone equal temperament (1330tet) or 1330 equal temperament (1330et) when viewed under a regular temperament perspective, is the tuning system that divides the octave into 1330 equal parts of about 0.902 ¢ each. Each step represents a frequency ratio of 21/1330, or the 1330th root of 2.
1330edo is enfactored in the 7-limit and has the same tuning as 665edo. It corrects 665edo's approximation of harmonic 11, only to be consistent up to the 11-odd-limit, unfortunately. It tempers out 3025/3024, 9801/9800, and 234375/234256, supporting hemienneadecal, though 1178edo is a better tuning for that purpose.
Prime harmonics
| Harmonic | 2 | 3 | 5 | 7 | 11 | 13 | 17 | 19 | 23 | 29 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Error | absolute (¢) | +0.000 | -0.000 | -0.148 | +0.197 | -0.040 | +0.375 | -0.294 | +0.231 | -0.304 | -0.104 | -0.073 |
| relative (%) | +0 | -0 | -16 | +22 | -4 | +42 | -33 | +26 | -34 | -11 | -8 | |
| Steps (reduced) |
1330 (0) |
2108 (778) |
3088 (428) |
3734 (1074) |
4601 (611) |
4922 (932) |
5436 (116) |
5650 (330) |
6016 (696) |
6461 (1141) |
6589 (1269) | |
Subsets and supersets
Since 1330 factors into 2 × 5 × 7 × 19, it has subset edos 2, 5, 7, 19, 35, 70, 95, 133, 190, 266, and 665. A step of 1330edo is exactly 24 imps (24\31920).