Musical note

A1

A1 is MIDI note 33, sounding at 55 Hz in equal temperament with A4 = 440 Hz. Its wavelength in air is 6.2364 m, and it sits in octave 1.

Pitch

Scientific pitch notationA1

MIDI note number33

Frequency55 Hzequal temperament, A4 = 440 Hz, a convention rather than a constant

Pitch classA (9)

Octave1

Wavelength in air6.2364 mat 343 m/s, dry air at 20 °C

Period18.1818 ms

Frequency one octave up110 Hzdoubling the frequency

Frequency one octave down27.5 Hz

AudibleYeshuman hearing runs roughly 20 Hz to 20 kHz and narrows with age

Perfect fifth belowD1 · 36.71 Hz

Major third aboveC#2 · 69.3 Hz

Perfect fifth aboveE2 · 82.41 Hz

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