D#1 — 38.89 Hz
D#1 (MIDI 27) vibrates 38.89 times per second at standard concert pitch. Play the reference tone below, or tune to it with the online tuner.
D#1 at different reference pitches
| Reference (A4) | D#1 frequency | Used for |
|---|---|---|
| 415 Hz | 36.68 Hz | Baroque pitch |
| 432 Hz | 38.18 Hz | “Verdi” pitch |
| 440 Hz | 38.89 Hz | Standard concert pitch |
| 442 Hz | 39.07 Hz | European orchestras |
| 444 Hz | 39.24 Hz | European orchestras |
Physical properties
- Period: one cycle every 25.71 ms
- Wavelength in air: ≈ 8.82 m (at 20 °C, 343 m/s)
- MIDI note number: 27
- Octave up: D#2 = 77.78 Hz · Octave down: 19.45 Hz