Voicing of A# Diminished 7

Drop 2 IV

Back to A#dim7

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Left hand
A#2
Right hand
C#4G4A#4E5
Family
Drop 2

The Drop 2 IV voicing of A#dim7 stacks C#, G, A# and E from the bottom up: the minor 3rd, diminished 7th, root and flat 5th of the chord.

It's one of the Drop 2 voicings: four-note chords in close position with the second note from the top dropped an octave, played over the root. The others for A#dim7 are Drop 2 I, Drop 2 II and Drop 2 III.