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7L 3s (4/1-equivalent): Difference between revisions

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{{Infobox MOS}}
{{Infobox MOS}}
'''7L 3s<4/1>''' (sometimes called '''diaquadic''') refers to a non-octave [[MOS scale]] family with a period of a [[4/1]] and which has 7 large and 3 small steps. These scales are in some ways a double octave clone of [[5L 2s|diatonic scale]]s because they are generated from perfect fifths and have the [[7edo]]/[[7ed4]] 685-cent flat fifth and [[5edo]]/10ed4's 720-cent sharp fifth at the ends of the tuning spectrum. However, ~3/2 is now the chroma-negative rather than chroma-positive generator, equalized and collapsed tunings are now swapped (equalized is 720-cent fifth and collapsed is 685-cent fifth), and the basic tuning is now the 705-cent gentle fifth from [[17edo]]/[[17ed4]] instead of 12edo's fifth. Diaquadic scales are also more widely spaced than diatonic scales, closer melodically to an octave-period pentatonic scale.
{{MOS intro}}


== Intervals ==
These scales are in some ways a double octave clone of [[5L 2s|diatonic scale]]s because they are generated from perfect fifths and have the [[7edo]]/[[7ed4]] 685{{c}} flat fifth and [[5edo]]/10ed4's 720{{c}} sharp fifth at the ends of the tuning spectrum. However, ~3/2 is now the chroma-negative rather than chroma-positive generator, equalized and collapsed tunings are now swapped (equalized is 720{{c}} fifth and collapsed is 685{{c}} fifth), and the basic tuning is now the 705-cent gentle fifth from [[17edo]]/[[17ed4]] instead of 12edo's fifth. Diaquadic scales are also more widely spaced than diatonic scales, closer melodically to an octave-period pentatonic scale.
{|class="wikitable"
|-
!Dark generators
!colspan="2"|Notation
![[17ed4]] cents
!
!Bright generators
!colspan="2"|Notation
![[17ed4]] cents
|-
|0
|C
|perfect 0-step
|1694.16
|
|0
|C
|perfect 10-step
|282.36
|-
|1
|F
|perfect 3-step
|705.90
|
|1
|K
|perfect 7-step
|1694.16
|-
|2
|Jb
|minor 6-step
|1411.80
|
|2
|E
|major 4-step
|988.26
|-
|3
|Bb
|minor 9-step
|2117.70
|
|3
|D
|major 1-step
|282.36
|-
|4
|Eb
|minor 2-step
|423.54
|
|4
|A
|major 8-step
|1976.52
|-
|5
|Hb
|minor 5-step
|1129.44
|
|5
|H
|major 5-step
|1270.62
|-
|6
|Ab
|minor 8-step
|1835.34
|
|6
|E
|major 2-step
|564.72
|-
|7
|Db
|minor 1-step
|141.18
|
|7
|B
|major 9-step
|2258.88
|-
|8
|Gb
|minor 4-step
|847.08
|
|8
|J
|major 6-step
|1552.98
|}


== Modes ==
== Scale properties ==
The darker modes contain both major triads and augmented triads on the root, and the brighter modes contain both minor and diminished triads on the root.
{{TAMNAMS use}}


* LLLsLLsLLs 9|0
=== Intervals ===
* LLsLLLsLLs 8|1
{{MOS intervals}}
* LLsLLsLLLs 7|2
* LLsLLsLLsL 6|3
* LsLLLsLLsL 5|4
* LsLLsLLLsL 4|5
* LsLLsLLsLL 3|6
* sLLLsLLsLL 2|7
* sLLsLLLsLL 1|8
* sLLsLLsLLL 0|9


=== Generator chain ===
{{MOS genchain}}
=== Modes ===
{{MOS mode degrees}}


== Scale tree ==
== Scale tree ==
{{Scale tree|Comments=5/3:Quarchy is around here;3/1:Tetrominant is around here;4/1:Meanquad is around here}}
{{MOS tuning spectrum
| 5/3 = Quarchy is around here
| 3/1 = Tetrominant is around here
| 4/1 = Meanquad is around here
}}


== Temperaments ==
== Temperaments ==
There are two major rank-2 temperament interpretations of diaquadic, corresponding to double octave clones of [[meantone]] and [[archy]].
There are two major rank-2 temperament interpretations of diaquadic, corresponding to double octave clones of [[meantone]] and [[archy]].
=== Meanquad ===
=== Meanquad ===
''Main article: [[Meanquad]]''
''Main article: [[Meanquad]]''
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* [[Support]]ing ETs: 7, 31, 38, 24, 17, 10, 69, 45, 55, 11[-5], 52, 41, 13[+5], 27[+5]  
* [[Support]]ing ETs: 7, 31, 38, 24, 17, 10, 69, 45, 55, 11[-5], 52, 41, 13[+5], 27[+5]  
* [[CTE tuning]]: ~[[3/2]] = 697.214
* [[CTE tuning]]: ~[[3/2]] = 697.214
==== Tetrominant ====
==== Tetrominant ====
* [[Subgroup]]: 4.5.6.7
* [[Subgroup]]: 4.5.6.7
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* [[Support]]ing ETs: 7, 17, 24, 10, 31, 41, 27[+5], 38[+7], 55[+7], 58[+5, +7], 65[+5, +7], 44[+5], 75[+5, +7]  
* [[Support]]ing ETs: 7, 17, 24, 10, 31, 41, 27[+5], 38[+7], 55[+7], 58[+5, +7], 65[+5, +7], 44[+5], 75[+5, +7]  
* [[CTE tuning]]: ~[[3/2]] = 699.622
* [[CTE tuning]]: ~[[3/2]] = 699.622
=== Quarchy ===
=== Quarchy ===
* [[Subgroup]]: 4.6.7
* [[Subgroup]]: 4.6.7
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