Voicing of A Diminished Triad

Doubled Root

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Left hand
A2C3Eb3A3
Family
Triads

The Doubled Root voicing of Adim stacks A, C, Eb and A from the bottom up: the root, minor 3rd, flat 5th and root of the chord.

It's one of the Triads voicings. The others for Adim are Root Inversion, 1st Inversion and 2nd Inversion.