A#1 — 58.27 Hz
A#1 (MIDI 34) vibrates 58.27 times per second at standard concert pitch. Play the reference tone below, or tune to it with the online tuner.
A#1 at different reference pitches
| Reference (A4) | A#1 frequency | Used for |
|---|---|---|
| 415 Hz | 54.96 Hz | Baroque pitch |
| 432 Hz | 57.21 Hz | “Verdi” pitch |
| 440 Hz | 58.27 Hz | Standard concert pitch |
| 442 Hz | 58.54 Hz | European orchestras |
| 444 Hz | 58.80 Hz | European orchestras |
Physical properties
- Period: one cycle every 17.16 ms
- Wavelength in air: ≈ 5.89 m (at 20 °C, 343 m/s)
- MIDI note number: 34
- Octave up: A#2 = 116.54 Hz · Octave down: 29.14 Hz