Voicing of B Half Diminished

Drop 2 II

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B2
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A3D4F4B4
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Drop 2

The Drop 2 II voicing of Bm7b5 stacks A, D, F and B from the bottom up: the minor 7th, minor 3rd, flat 5th and root 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 Bm7b5 are Drop 2 I, Drop 2 III and Drop 2 IV.