D2 — 73.416 Hz
D2 (D2) is 73.416 Hz in standard equal temperament at A=440 Hz. It is MIDI note number 38.
D2 Frequency in All Tuning Systems
| Temperament | Frequency (Hz) | Cents from Equal | Common Usage |
|---|---|---|---|
| Equal Temperament | 73.416 Hz | 0.00 | Modern standard; piano, fretted instruments |
| Pythagorean | 73.333 Hz | -1.96 | Medieval/early music; string ensemble open fifths |
| Just Intonation (Major) | 73.582 Hz | +3.91 | A cappella vocal, barbershop, Renaissance |
| Just Intonation (Minor) | 73.582 Hz | +3.91 | Minor-key vocal music, string ensembles |
| Quarter-Comma Meantone | 73.561 Hz | +3.42 | Renaissance keyboard, early Baroque organ |
| Third-Comma Meantone | 73.637 Hz | +5.20 | Renaissance vocal music in minor keys |
| Sixth-Comma Meantone | 73.499 Hz | +1.96 | Baroque orchestral ensemble compromise |
| Werckmeister III | 73.582 Hz | +3.91 | Baroque keyboard; Bach contemporaries |
| Werckmeister IV | 73.582 Hz | +3.91 | Baroque keyboard, strong key contrast |
| Werckmeister V | 73.749 Hz | +7.83 | Specialized Baroque keyboard |
| Kirnberger III | 73.561 Hz | +3.42 | Classical-era keyboard, keys near C major |
| Vallotti | 73.499 Hz | +1.96 | Baroque/Classical orchestral tuning |
| Young (1799) | 73.499 Hz | +1.96 | Classical-era keyboard |
| Bach/Lehman | 73.499 Hz | +1.96 | Bach keyboard works, Well-Tempered Clavier |
| Neidhardt | 73.499 Hz | +1.96 | 18th century keyboard, near-equal alternative |
| Kellner (Bach) | 73.549 Hz | +3.13 | Bach keyboard reconstruction |
Positive cents = sharper than equal temperament. Negative cents = flatter. 100 cents = 1 semitone.
D2 at Different Concert Pitches
The same note varies in frequency depending on the concert pitch standard used by your ensemble.
| Concert Pitch | Frequency (Hz) | Common Usage |
|---|---|---|
| A = 440 Hz (ISO standard) | 73.416 Hz | US, UK, and most modern ensembles worldwide |
| A = 442 Hz | 73.750 Hz | Many European orchestras; France, Germany |
| A = 443 Hz | 73.917 Hz | Berlin Philharmonic; some US orchestras |
| A = 432 Hz | 72.081 Hz | Alternative tuning; Baroque revival |
| A = 415 Hz (Baroque) | 69.245 Hz | Historically-informed Baroque performance |
f = f_at_A440 × (concert_pitch / 440)
Instruments That Play D2
D2 (73.416 Hz) falls within the comfortable playing range of 18 instruments.
D2 Across All Tuning Systems
Explore how D2 is tuned in each historical temperament system. Each tuning system gives D2 a slightly different frequency, affecting the harmonic character of chords and melodies.
Tune D2 with precision — Get Tunable.
Tunable supports 15+ tuning systems including equal temperament, Pythagorean, just intonation, and historical well-temperaments. See exact Hz values in real-time as you play.