C♯m7♭5♭9 8-string bass chord

How to play C♯m7♭5♭9 on 8-string bass

The most common way, the first shape above: lay your index finger flat across the four strings from the B to the D at the 2nd fret, your middle finger on the C string at the 2nd fret and your ring finger on the F string at the 2nd fret. Let the G string ring open. Don’t play the F♯ and E strings.

From the F♯ string x 2 x 2 2 0 2 2 (x: not played, 0: open)

What notes are in C♯m7♭5♭9?

C♯m7♭5♭9, C♯ half-diminished seventh flat nine, is C♯, E, G, B and D: the root (C♯), the minor third (E), the diminished fifth (G), the minor seventh (B) and the flat ninth (D). Its formula is 1 ♭3 ♭5 ♭7 ♭9.