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{{Infobox Interval | {{Infobox Interval | ||
| Name = 4th harmonic, tetrave, | | Name = 4th harmonic, double octave, perfect fifteenth, tetrave, quadruple | ||
| Color name = wa 15th | | Color name = wa 15th | ||
| Sound = jid_4_1_pluck_adu_dr110.mp3 | | Sound = jid_4_1_pluck_adu_dr110.mp3 | ||
}} | }} | ||
{{Wikipedia| Fifteenth }} | |||
'''4/1''' | '''4/1''', the '''4th harmonic''', '''double octave''', '''perfect fifteenth''', '''tetrave''' or '''quadruple''', is the [[harmonic]] past [[3/1]] and before [[5/1]]. It is the first composite harmonic, equal to a stack of two [[octave]]s: ([[2/1]])<sup>2</sup>. | ||
It can act as the [[interval of equivalence]] in temperaments that omit every other octave, such as [[meansquared]]. | |||
== See also == | == See also == | ||
* [[Ed4]] – | * [[Ed4]] – equal divisions of the 4th harmonic | ||
[[Category:Taxicab-2 intervals]] | |||