Open D (DADF#) Tuning
Tune your mandolin to Open D (DADF#) — D3, A3, D4, F#4
About Open D (DADF#) Tuning
Open D tuning (D3-A3-D4-F#4) produces a D major chord on open courses. All four courses are tuned lower than standard, creating a warmer, deeper sound than standard GDAE. Open D is widely used in Celtic mandolin playing, where the D drone connects naturally to the key structures of Irish and Scottish music.
In Celtic sessions, D is one of the most common keys. Open D tuning lets the mandolin player create a constant D drone on the lower courses while picking melody on the upper courses — mimicking the drone-and-melody approach of the Irish bouzouki and uilleann pipes. This makes the mandolin a more effective rhythm and accompaniment instrument in session settings.
The lower overall pitch also changes the mandolin's character. Standard tuning is bright and cutting; Open D is warmer and more blended. Many players find it sits better in an ensemble, providing harmonic support without dominating the mix.
String Notes
Recommended Strings
Since all courses tune lower in Open D, string tension drops across the board. Medium gauge strings (.011-.040) help compensate. The G course drops to D3, a significant pitch reduction — if it buzzes or sounds unfocused, consider a heavier gauge for the lowest course. Light gauge strings may feel too loose in this tuning.
How to Tune to Open D (DADF#)
- 1.Start from standard GDAE. All four courses change.
- 2.Lower the G course from G3 to D3 (146.83 Hz). This is a large drop — a perfect fourth.
- 3.Lower the D course from D4 to A3 (220 Hz). One octave below concert A.
- 4.Lower the A course from A4 to D4 (293.66 Hz). It should now be one octave above the lowest course.
- 5.Lower the E course from E5 to F#4 (369.99 Hz).
- 6.Strum all courses open — you should hear a warm D major chord. The overall pitch is noticeably lower than standard tuning.
Common Chords in Open D (DADF#)
D Major (open)
All courses open. A rich, resonant D major chord that defines this tuning's warm character.
G Major
The IV chord. Simple shapes against the D drone create the most common Celtic chord movement.
A Major
The V chord. Resolves back to the open D with satisfying harmonic motion.
Bm
The vi chord in D. Important for Celtic tunes that move between major and relative minor.