It sounds sleek and tense. Played as a tritone substitution the ♭5 is the root of the dominant it replaced.
2 moveable shapes. None has an open string in it, so each one plays every root there is; the dots are degrees, and R is the root.
Pick a root and every diagram below moves to it. Nothing about any of the shapes changes — only the fret they start on, and each one starts somewhere different because they are rooted on different strings.
Showing C9♭5. Every voicing of it, open strings included, is on its own chord page.
The lowest root available, so these are the fullest-sounding shapes and the ones that carry a band. F at the first fret, G at the third, A at the fifth: the shape is the same and the fret is the whole of the difference.
878778
6 notes · 2 frets
The other half of the pair. Pair them with the low E shapes and the hand barely moves: the root a fourth up sits at the same fret on the A string, and the root a fifth up two frets higher.
x32332
5 notes · 2 frets
Every voicing of one particular 9♭5 chord — including the open-string ones that do not move — is on that chord's own page, linked under each shape above. All the moveable shapes for every quality are on the shapes index, and the altered dominant chords as a family are on their own page.
Shows each chord the way this style would voice it, and marks which of its alternatives belong to the idiom.