Adim7 8-string bass chord

How to play Adim7 on 8-string bass

The most common way, the first shape above: your index finger on the D string at the 1st fret, your ring finger on the G string at the 2nd fret and your middle finger on the F string at the 1st fret. Let the A and C strings ring open. Don’t play the F♯, B and E strings.

From the F♯ string x x x 0 1 2 0 1 (x: not played, 0: open)

What notes are in Adim7?

Adim7, A diminished seventh, is A, C, E♭ and G♭: the root (A), the minor third (C), the diminished fifth (E♭) and the diminished seventh (G♭). Its formula is 1 ♭3 ♭5 ♭♭7.

Why do four diminished seventh chords have the same notes?

A diminished seventh is minor thirds stacked all the way round, A, C, E♭ and G♭, so Adim7 has the same notes as the diminished sevenths on C, E♭ and G♭. Any of its notes can be the root.