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174 Hz
174 Hz is one steady tone, a single pure pitch just below F3, with nothing layered over it and nothing moving. It's the lowest tone in the solfeggio set and the deepest of the three on this site. It suits you if you want a plain, unchanging hum rather than rain, noise or texture.
Ready to play
Put this under rain or a fire, keep the blend you end up with, and play it through the night with your screen off. The Slo app does that on iOS, Android and Mac.
What 174 Hz sounds like
It's one tone at 174 Hz, the same in both ears, and nothing in it changes from one minute to the next. The pitch sits a fraction below F3, low enough to sound like a hum rather than a whistle. There's no hiss, rain or texture behind it. A bare tone is either exactly what you came for or far too plain, and a few seconds of listening will tell you which. If you want to set the frequency yourself, the binaural beats generator has an adjustable tone; it needs headphones.
Where the solfeggio numbers come from
Solfeggio tones are a modern tradition. The set was assembled in the 1970s from a numerological reading of the Book of Numbers, not from documented Gregorian practice, and no clinical guideline or systematic review supports the healing claims attached to them. People use these tones because they find them pleasant to listen to. That is the honest reason, and it is reason enough.
Compare it by ear against the 285 Hz tone and the 396 Hz tone, or browse every browser player from the sound library index. A bare sine is easier to sit with when something textured sits under it — open the 174 Hz and brown noise blend in the free sound mixer and move either layer to taste.
Frequently asked questions
What musical note is 174 Hz?
It sits just below F3, which is 174.61 Hz in standard concert tuning. To most ears it simply sounds like a low F.
Does a 174 Hz tone do anything to the body?
No claim of that kind is supported. No clinical guideline or systematic review backs the properties traditionally attached to solfeggio frequencies. Play it if you like how it sounds.
Do I need headphones for this tone?
No. Both ears get the same tone, so speakers and headphones give you the same thing.
Can I layer 174 Hz with other sounds?
Yes. Add it in the free browser mixer alongside noise, rain, or fire, and set each layer to its own level.