Audio frequency

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An audio frequency (abbreviation: AF), or audible frequency is characterized as a periodic vibration whose frequency is audible to the average human. While the range of frequencies that any individual can hear is largely related to environmental factors, the generally accepted standard range of audible frequencies is 20 to 20,000 hertz. Frequencies below 20 Hz can usually be felt rather than heard, assuming the amplitude of the vibration is high enough. Frequencies above 20,000 Hz can sometimes be sensed by young people, but high frequencies are the first to be affected by hearing loss due to age and/or prolonged exposure to very loud noises.

Frequency (Hz)	Octave	Description
16 to 32	1st	The human threshold of feeling, and the lowest pedal notes of a pipe organ.
32 to 512	2nd to 5th	Rhythm frequencies, where the lower and upper bass notes lie.
512 to 2048	6th to 7th	Defines human speech intelligibility, gives a horn-like or tinny quality to sound.
2048 to 8192	8th to 9th	Gives presence to speech, where labial and fricative sounds lie.
8192 to 16000	10th	Brilliance, the sounds of bells and the ringing of cymbals. In speech, the sound of the letter "S" (8000-11000 Hz)

MIDI Note	Frequency (Hz)	Description	Sound File
C-2	4.09	Lowest note for Gregg Bailey's 64' PVC subcontrabass clarinet	N/A (inaudible)
C-1	8.18	Lowest organ note	N/A (inaudible)
C0	16.35	Lowest note for tuba, large pipe organs, Bösendorfer Imperial Grand Piano
C1	32.70	Lowest C on a standard 88-key piano.
C2	65.41	Lowest note for cello
C3	130.81	Lowest note for viola, mandola
C4	261.63	Middle C
C5	523.25	Lowest note for a piccolo.
C6	1046.50	Approximately the highest note reproducible by the average female human voice.
C7	2093	Highest note for a flute.
C8	4186	Highest note on a standard 88-key piano.
C9	8372
C10	16744	Approximately the tone that a typical CRT television emits while running.