Musical Frequencies
D2
73.42 Hz
Note: D2
Cosmic Octave Color
Derived visible color (464 nm)
Display swatch #2595ff
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 D in octave 2. Bass to mid range.
Period
13.62 ms
Wavelength
4.67 m
Nearest Note
D2 (0¢)
Claim Type
Musical Standard
Cosmic Octave Color
Derived visible color (464 nm) · #2595ff
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.
D1Musical Frequencies
36.71 Hz0¢
D3Musical Frequencies
146.83 Hz-0.1¢
D4Musical Frequencies
293.66 Hz-0.1¢
D5Musical Frequencies
587.33 Hz-0.1¢
D6Musical Frequencies
1.2 kHz-0.1¢
D7Musical Frequencies
2.3 kHz-0.1¢
musicequal-temperamentoctave-2