|6||x or Ab||4th fretfr.||optionalopt.|
Chord Db11 notes: (Ab), Db, Gb, Cb, Eb and Ab. (Cb=B).
This chord is played by placing a barre on fret four with your index finger. The note Ab on the sixth string is not required, but can be played on the 4th fret if needed.
Observation: the Db11 (Db dominant 11th) chord should include a 3rd, but it is often omitted - transforming it into a simple Db9sus4 or Db9sus.
1(C#/Db), 3(F), 5(G#/Ab), b7(B/Cb), 9(D#/Eb), 11(F#/Gb).