Voicing of C# Diminished Triad

Doubled Root

Back to C#dim

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Left hand
C#3E3G3C#4
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Triads

The Doubled Root voicing of C#dim stacks C#, E, G and C# 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 C#dim are Root Inversion, 1st Inversion and 2nd Inversion.