D7♭5 8-string bass chord

How to play D7♭5 on 8-string bass

The most common way, the first shape above: your index finger on the G string at the 1st fret and your middle finger on the F string at the 1st fret. Let the D and C strings ring open. Don’t play the F♯, B, E and A strings.

From the F♯ string x x x x 0 1 0 1 (x: not played, 0: open)

What notes are in D7♭5?

D7♭5, D dominant seventh flat five, is D, F♯, A♭ and C: the root (D), the major third (F♯), the diminished fifth (A♭) and the minor seventh (C). Its formula is 1 3 ♭5 ♭7.