C♯ 11th chord on guitar (C♯11)

Why it sounds like that

C♯ 11th stacks a major triad with a ♭7, 9, and 11: 1–3–5–♭7–9–11. The 11th (F♯) adds a suspended colour over the dominant seventh. Compare C♯ 9th, which lacks the 11th.

What goes wrong with C♯ 11th?

• The B string is muted because the index barre is not pressing hard enough at the 2nd string.
• The high e string is deadened by the pinky accidentally touching it before fret 11.
• The ring finger leans on the B string, preventing it from ringing.

When to use it

C♯ 11th is the V chord in F♯ major, resolving to F♯ major in progressions like F♯–B–C♯–F♯ (I–IV–V–I). Its dominant tension suits rock, blues, and funk, especially when you want a fuller sound than C♯ 9th.

Changing to and from C♯ 11th

• Move to F♯ major by lifting the ring and pinky fingers, then barre the 9th fret and place your ring finger on the 5th string at fret 11.
• Slide the shape down two frets to the 7th fret for B 11th.

Which voicing to use

The 9th fret root-position voicing keeps C♯ in the bass for a grounded sound. The E♯ inversions put the third in the bass, making the chord brighter and less stable, while the D♯ inversion creates a suspended bass movement.