Musical note
A#4
- A#4
- 466.16 Hz
- MIDI 70
A#4 (enharmonically Bb4) is MIDI note 70, sounding at 466.164 Hz in equal temperament with A4 = 440 Hz. Its wavelength in air is 0.7358 m, and it sits in octave 4.
Pitch
Scientific pitch notationA#4
Enharmonic equivalentBb4the same pitch in equal temperament, spelled differently
MIDI note number70
Pitch classA# (10)
Octave4
As a sound wave
Wavelength in air0.7358 mat 343 m/s, dry air at 20 °C
Period2.1452 ms
Frequency one octave down233.082 Hz
AudibleYeshuman hearing runs roughly 20 Hz to 20 kHz and narrows with age
Intervals from here
Octave belowA#3 · 233.08 Hz
Perfect fifth belowD#4 · 311.13 Hz
Semitone belowA4 · 440 Hz
Semitone aboveB4 · 493.88 Hz
Major third aboveD5 · 587.33 Hz
Perfect fifth aboveF5 · 698.46 Hz
Octave aboveA#5 · 932.33 Hz
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