375edo

← 374edo

375edo

376edo →

Prime factorization	3 × 53
Step size	3.2¢
Fifth	219\375 (700.8¢) (→73\125)
Semitones (A1:m2)	33:30 (105.6¢ : 96¢)
Dual sharp fifth	220\375 (704¢) (→44\75)
Dual flat fifth	219\375 (700.8¢) (→73\125)
Dual major 2nd	64\375 (204.8¢)
Consistency limit	3
Distinct consistency limit	3

375 equal divisions of the octave (abbreviated 375edo or 375ed2), also called 375-tone equal temperament (375tet) or 375 equal temperament (375et) when viewed under a regular temperament perspective, is the tuning system that divides the octave into 375 equal parts of exactly 3.2 ¢ each. Each step represents a frequency ratio of 2^1/375, or the 375th root of 2.

Theory

375edo is inconsistent to the 5-odd-limit and harmonic 3 is about halfway between its steps. It can be used as a temperament in the 2.9.5.7.13.17.19 subgroup, in which it tempers out 250047/250000, 589824/588245, and [8 7 -13⟩ (parakleisma).

For the full 7-limit, the 375cd val is the best, where it tempers out 1029/1024 and 15625/15552, supporting tritikleismic. In the 11-limit it tempers out 385/384 and 441/440, supporting undecimal tritikleismic.

Using the patent val, it tempers out 6144/6125 and 177147/175616, supporting aufo. In the 11-limit it tempers out 540/539 and 5632/5625, supporting aufic and persephone.

Odd harmonics

Approximation of odd harmonics in 375edo

Harmonic		3	5	7	9	11	13	15	17	19	21	23
Error	absolute (¢)	-1.16	+0.89	+0.77	+0.89	-0.92	+1.07	-0.27	+0.64	+0.09	-0.38	-1.07
	relative (%)	-36	+28	+24	+28	-29	+34	-8	+20	+3	-12	-34
Steps (reduced)		594 (219)	871 (121)	1053 (303)	1189 (64)	1297 (172)	1388 (263)	1465 (340)	1533 (33)	1593 (93)	1647 (147)	1696 (196)

Subsets and supersets

Since 375 factors into 3 × 5³, 375edo has subset edos 3, 5, 15, 25, 75, and 125. 1175edo, which triples it, gives a good correction to the harmonic 3 and is consistent to the 15-odd-limit.

Regular temperament properties

Subgroup	Comma List	Mapping	Optimal 8ve Stretch (¢)	Tuning Error
				Absolute (¢)	Relative (%)
2.9	[1189 -375⟩	[⟨375 1189]]	-0.1404	0.1404	4.39
2.9.5	[8 7 -13⟩, [97 -24 -9⟩	[⟨375 1189 871]]	-0.2208	0.1615	5.05
2.9.5.7	250047/250000, 589824/588245, [8 7 -13⟩	[⟨375 1189 871 1053]]	-0.2345	0.1418	4.43