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, 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 often considered an augmented sixth rather than a minor seventh, and especially in septimal meantone it is tuned identically to 7/4, so that the chord reduces to the much simpler 4:5:6:7. However, chords employing it may still be considered a kind of dominant seventh chord.