Instrument Resonances

Shruti Box (Drone)

261.63 Hz

Note: C4

Cosmic Octave Color

Derived visible color (521 nm)

Display swatch #44c55f

EstablishedInstrument / Acoustic Reference

Evidence Level

Established

Source Count

Last Reviewed

March 23, 2026

Directly measured, standardized, or well-supported in mainstream scientific or technical literature.

This entry describes an instrument or resonance reference. Therapeutic outcomes depend on context, level, instrument build, and listener response.

Review the evidence model

A small bellows-driven reed organ producing sustained drone tones. Essential in Indian classical music to establish the tonic (Sa). Used in sound healing for vocal toning and chanting support.

Wavelength

1.31 m

Nearest Note

C4 (0¢)

Claim Type

Instrument / Acoustic Reference

Cosmic Octave Color

Derived visible color (521 nm) · #44c55f

Source

Indian classical music

Sources

Traditional and Practitioner Sound Sources

1 atlas references

Historical, cultural, and practitioner sources used to document how frequencies are talked about in practice communities.

Traditional and practitioner sound-healing sources.

Historical Use

Drone accompaniment in Indian classical music, sound healing, chanting

instrumentshruti-boxindiandrone