To play the Dbsus chord, perform a barre by pressing your index finger on the top g-string and C-string on the 1st fret, middle finger on the 2nd fret of the E-string, and little finger on the 4th fret of the bottom A-string.
The Dbsus chord (also known as the C#sus chord) contains the notes Db-Gb-Ab.
In this case, the "sus" in the chord name, which means suspended is referring to a "sus4" note.
To build a Dbsus chord, take the suspended fourth chord formula (1-4-5) and apply it to the Db major scale (Db, Eb, F, Gb, Ab, Bb, C).
Identify the first, fourth, and fifth scale degrees in the Db major scale which are Db-Gb-Ab, which gives you a Dbsus chord.
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