666edo: Difference between revisions
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== Theory == | == Theory == | ||
666edo is [[enfactoring|enfactored]] in the 17-limit, with the same mapping as [[333edo]], | 666edo is [[enfactoring|enfactored]] in the 17-limit, with the same mapping as [[333edo]] which it doubles where it tempers out exactly the same commas and inherits its strong approximations for [[11/8]] and [[7/6]]. Hence on the patent vals up to 17-limit it doesn't provide much new apart from characteristics of what it doubles. | ||
Nonetheless, the 2.9.15.21.11.17.19 [[subgroup]] is great for 666edo. Alternatively, it can be used with 2.9.15.7.11.19.23. Additionally, the 2.9.15.11.39.23/7 subgroup is useful as a fractional subgroup, representing direct approximations for [[15/11]], [[16/11]], [[16/15]], [[13/12]], [[13/10]], [[22/15]], [[23/14]]. | |||
For non-patent vals, 666ceefg val {{val| 666 1056 '''1547''' 1870 '''2305''' '''2465''' '''2723'''}} is recommended as it is the best tuned in the 17-limit (better than the patent val). A comma basis for the 17-limit is {936/935, 3584/3575, 2431/2430, 4375/4374, 2401/2400, 34496/34425}. This val supports the [[ennealimmal]] temperament in the 7-limit and a lesser known extension of it into the 13-limit as 270 & 666ceef. | |||
666edo is also used by [[Eliora]] to approximate the "[[Factor 9 grid]]", or the just intonation esoteric scale deconstructed and debunked by Adam Neely. Now, it may be worth noting that the tuning system which truly has an excellent approximation of the Factor 9 grid is 666ed15/14, approximately equivalent to [[6691edo]]. However, this fact was not spotted by Eliora until after first music was composed in 666edo due to the temperament finder layout making it not immediately obvious what is the interval of equivalence, so the Factor 9 grid representation by 666edo still remains notable given that it is a scale for some of the first music composed in this edo. | 666edo is also used by [[Eliora]] to approximate the "[[Factor 9 grid]]", or the just intonation esoteric scale deconstructed and debunked by Adam Neely. Now, it may be worth noting that the tuning system which truly has an excellent approximation of the Factor 9 grid is 666ed15/14, approximately equivalent to [[6691edo]]. However, this fact was not spotted by Eliora until after first music was composed in 666edo due to the temperament finder layout making it not immediately obvious what is the interval of equivalence, so the Factor 9 grid representation by 666edo still remains notable given that it is a scale for some of the first music composed in this edo. | ||
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== Regular temperament properties == | == Regular temperament properties == | ||
=== Rank-2 temperaments === | === Rank-2 temperaments === | ||
Note: temperaments supported by [[333edo]] are not included. | |||
{| class="wikitable center-all left-5" | {| class="wikitable center-all left-5" | ||
|+ style="font-size: 105%;" | Table of rank-2 temperaments by generator | |+ style="font-size: 105%;" | Table of rank-2 temperaments by generator | ||
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| [[Hemiennealimmal]] (666cf) | | [[Hemiennealimmal]] (666cf) | ||
|} | |} | ||
<nowiki />* [[Normal | <nowiki />* [[Normal forms #Equave-reduced-generator form|Octave-reduced form]], reduced to the first half-octave, and [[normal forms #Minimal-generator form|minimal form]] in parentheses if distinct | ||
== Scales == | == Scales == | ||