Musical Frequencies
D#0
19.45 Hz
Note: D#0
Cosmic Octave Color
Derived visible color (438 nm)
Display swatch #4471ff
Octave-shifted: 38.90 Hz (+1 octaves)
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 0. Sub-bass range.
Period
51.41 ms
Wavelength
17.63 m
Claim Type
Musical Standard
Cosmic Octave Color
Derived visible color (438 nm) · #4471ff
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
musicequal-temperamentoctave-0