Musical Frequencies
D#7
2.5 kHz
Note: D#7
Cosmic Octave Color
Derived visible color (438 nm)
Display swatch #4471ff
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 7. High treble range.
Period
0.40 ms
Wavelength
13.8 cm
Nearest Note
D#7 (0¢)
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
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.
D#1Musical Frequencies
38.89 Hz0¢
D#2Musical Frequencies
77.78 Hz0¢
D#3Musical Frequencies
155.56 Hz0¢
D#4Musical Frequencies
311.13 Hz0¢
D#5Musical Frequencies
622.25 Hz0¢
D#6Musical Frequencies
1.2 kHz0¢
musicequal-temperamentoctave-7