C9♭5 8-string bass chord

How to play C9♭5 on 8-string bass

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

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

What notes are in C9♭5?

C9♭5, C ninth flat five, is C, E, G♭, B♭ and D: the root (C), the major third (E), the diminished fifth (G♭), the minor seventh (B♭) and the ninth (D). Its formula is 1 3 ♭5 ♭7 9.