Root on A string
x-11-12-11-13-x
A♭7♭5 is the A♭ dominant 7 flat 5 chord. Its notes are A♭, C, E♭♭ and G♭. It is the same chord as G♯7♭5. A four-note altered dominant. Mute both outer strings.
x-11-12-11-13-x
Numbers show frets from the low E string to the high e string; x means don't play that string.
Every A♭, C, E♭♭ and G♭ on the first 12 frets. The filled dots are the root, A♭. Build your own shape from any nearby group.
Other A♭ chords
Other dominant 7 flat 5 chords