Musical Frequencies
F2
87.31 Hz
Note: F2
Cosmic Octave Color
Derived visible color (390 nm)
Display swatch #9f3de9
EstablishedMusical Standard
Evidence Level
Established
Source Count
1
Last Reviewed
March 23, 2026
Directly measured, standardized, or well-supported in mainstream scientific or technical literature.
This entry documents a musical reference or standard. It should be read as an acoustic and musical reference rather than a biological claim.
Review the evidence modelMusical note F in octave 2. Bass to mid range.
Period
11.45 ms
Wavelength
3.93 m
Nearest Note
F2 (0¢)
Claim Type
Musical Standard
Cosmic Octave Color
Derived visible color (390 nm) · #9f3de9
Source
Equal temperament tuning system (A4 = 440 Hz)
Sources
Equal Temperament Tuning System
108 atlas references
The twelve-tone equal temperament reference used for note-frequency lookups throughout the atlas.
Standard equal-temperament note table with A4 = 440 Hz.
Harmonic Series
Octave Ladder
Every audible octave of this frequency — the same tone, higher and lower.
Nearby in the Atlas
Entries within ±35 cents of this tone when reduced to the same octave — candidates for pairing or comparison.
F4Musical Frequencies
349.23 Hz0¢
F5Musical Frequencies
698.46 Hz0¢
F3Musical Frequencies
174.61 Hz-0.1¢
F6Musical Frequencies
1.4 kHz-0.1¢
F7Musical Frequencies
2.8 kHz-0.1¢
F8Musical Frequencies
5.6 kHz-0.1¢
musicequal-temperamentoctave-2