Solfeggio frequency
639 Hz — Solfeggio Frequency (“FA”)
639 Hz is the Solfeggio tone labelled “FA”, in the upper-mid range near the note D#5.
Audio visualization
Hz
20 Hz20 kHz
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About the 639 Hz tone
639 Hz is a brighter, more present tone than the lower Solfeggio frequencies, which makes it easy to pick out when layered under music.
This page plays it as a steady sine wave. We keep the description factual and make no claims — adjust the waveform and volume to whatever suits you.
Technical details
- Frequency
- 639 Hz
- Nearest note
- D#5 (+46¢)
- Category
- Solfeggio frequency
- Period
- 1.56 ms
- Wavelength (air)
- 53.7 cm
- Octave up / down
- 1278 Hz / 319.5 Hz
Common uses
- An upper-mid tone for ambient or meditation layering
- Combine with 396 and 528 Hz from the same series
- Ear-training reference near the note D#5