128:160:192:225

Chord information

Harmonics	128:160:192:225
Subharmonics	1/(225:180:150:128)
Intervals from root	1/1 – 5/4 – 3/2 – 225/128
Cents from root	0¢ 386¢ 702¢ 977¢
Step intervals	5/4, 6/5, 75/64
Step cents	386¢, 316¢, 275¢
Prime limit	5
Genus	32 ⋅ 52 (225)
Intervallic odd limit	225
Otonal odd limit	225
Utonal odd limit	225
Consistent edos (d ≥ 2)	22edo*, 31edo*, 53edo*, 65edo*
* 2 ≤ d < 4; ** 4 ≤ d < 8; *** 8 ≤ d < 16; …

128:160:192:225, a 5-limit interpretation of an inversion of the Neapolitan or German sixth chord, is found rooted at the ♭II (16⁄15) and ♭VI (8⁄5) of the duodene.

225/128 is usually considered an augmented sixth rather than a minor seventh; however, it is often tempered in a way that makes this chord indistinguishable from certain kinds of dominant seventh chord. For example, in septimal meantone it is tuned identically to the much simpler harmonic seventh chord 4:5:6:7, and in meantone tunings that also temper out the Pythagorean comma (such as 12edo and its multiples) it is tuned identically to 36:45:54:64 and 20:25:30:36.