Infrasound and Voice: Below-20 Hz Human Voices

Infrasound is sound with a frequency below 20 Hz—the lower limit of typical human hearing. You can’t hear infrasound with your ears, but you might feel it as vibration or physical sensation. It’s called “subsonic” in some contexts, though that term is also used for speeds below the speed of sound.

Infrasound exists in nature: wind, ocean waves, earthquakes, and violent weather produce infrasound. Large industrial equipment (pumps, fans, diesel engines) generates infrasound. Some animals communicate or navigate using infrasound—whales produce extremely low-frequency calls, and elephants use infrasound to coordinate over long distances.

The human hearing range is generally considered 20 Hz to 20,000 Hz (20 kHz). Below 20 Hz, we don’t perceive sound as sound. We might feel it as pressure, vibration, or discomfort in our body, but we’re not hearing it in the traditional sense.

Can the Human Voice Produce Infrasound?

Short answer: No, not really. The human voice’s fundamental frequency, even at its absolute lowest, doesn’t consistently reach into true infrasound territory.

Here’s why:

Typical voice range: Most adult men’s voices range from about 85–180 Hz. The deepest bass singers can reach 50–80 Hz under optimal conditions. The absolute lowest recorded human voice frequency is around 0.189 Hz (achieved by American vocalist Tim Storms with extreme vocal fold manipulation), but this is a laboratory stunt, not normal singing or speech.

The 20 Hz barrier: To produce true infrasound (below 20 Hz), a voice would need to vibrate vocal cords at fewer than 20 cycles per second. That’s physiologically extremely difficult. Most people can’t sustain control below 50 Hz. Even professional bass singers or trained vocalists almost never enter the 20 Hz region during normal voice use.

Harmonic content matters: Even if your fundamental frequency is 50 Hz, your voice has harmonics (multiples of the fundamental) at 100, 150, 200 Hz, etc. Those harmonics are well above the infrasound threshold. When people measure “voice frequency,” they’re usually measuring either the fundamental or the whole harmonic spectrum, both of which sit well above 20 Hz for typical voices.

So when you see claims about “infrasound voices” or people “producing infrasound,” it’s usually either: (a) confusion about what infrasound is, (b) very exaggerated marketing, or (c) reference to very low but not truly subsonic frequencies (like 30–50 Hz, which sound deep but aren’t infrasound).

Very Low Frequencies vs. True Infrasound

This is where the confusion starts.

Very low frequencies (30–100 Hz): These are low enough to feel like rumble, produce physical vibrations in the chest, and create a sense of power or weight in the voice. They’re still audible to humans as pitch, though they’re at the bottom of our range.

True infrasound (below 20 Hz): Not audible as pitch. You don’t hear it; you feel it as pressure or vibration.

A bass singer producing a deep 50 Hz note is generating a very low frequency that feels powerful, resonant, and rumbling. But it’s not infrasound. If that singer’s voice somehow entered the 15 Hz range, then it would be infrasound—but at that point, it’s more vibration than voice, and it’s not something normal voices do.

The marketing confusion happens because:

• “Infrasound” sounds impressive and mysterious
• Very low frequencies do produce interesting physical sensations
• People equate “deep rumble” with “infrasound”
• Some audio equipment or meditation products are described as “infrasound” when they’re actually just very low-frequency

Why the Confusion About Voice and Infrasound?

Part of it stems from studies on infrasound effects. Some research has suggested that exposure to infrasound (real infrasound, below 20 Hz) can cause discomfort, vibration sensation, or even physiological response in humans. This has led to claims that “infrasound voices” can create special experiences or effects.

But here’s the issue: if your voice isn’t actually producing infrasound (below 20 Hz), those studies don’t apply. You’re getting effects from very low audible frequencies (30–50 Hz), which have their own interesting properties, but they’re not infrasound effects.

Another layer: some people conflate “low frequency” with “infrasound” without realizing the technical threshold. A 30 Hz rumble is extremely low and might feel profound, but it’s well above the 20 Hz cutoff.

Low Frequencies and Physical Sensation

That said, very low frequencies (below 100 Hz) do have special properties worth understanding:

Physical vibration: Low frequencies cause large-scale oscillations in air pressure. You feel these as vibration in your body, not as pitch in your ears. A 50 Hz tone from a bass singer vibrates the air in the room, and you feel it in your chest or through your seat if you’re sitting.

Resonance with body parts: Certain body cavities and organs have resonant frequencies in the low-frequency range. Very low frequencies can resonate with your chest cavity, abdomen, or head, creating a felt sense that’s different from higher frequencies.

Emotional or physiological response: Some research suggests that very low frequencies can trigger physiological responses—changes in heart rate, breathing, or other autonomic effects. This might be perceived as powerful or even unsettling, depending on context and individual sensitivity.

Instrument comparison: A pipe organ producing 32 Hz (a very low but audible frequency) sounds different from a 32 Hz sine wave—the organ’s timbre and harmonics color the perception, while the pure sine wave is felt more than heard.

None of this requires infrasound (below 20 Hz) to work. Very low audible frequencies produce fascinating effects on their own.

Frequently Asked Questions

Can any human produce infrasound with their voice?

Theoretically, yes, under extreme conditions. But practically, no. Even trained bass singers rarely go below 50 Hz, and sustained infrasound production would require unusual vocal technique (if it’s possible at all). For most people, infrasound is out of reach.

If I can’t hear infrasound, how do I know it’s there?

Infrasound is typically detected with equipment, not ears. Microphones, accelerometers, or specialized sensors can measure frequencies below 20 Hz. Humans might perceive infrasound as vibration, pressure, or discomfort rather than sound, but we can’t perceive the specific frequency.

Do very low voice frequencies (like 50 Hz bass notes) have special effects?

Yes, in the sense that they produce vibration, might trigger physical resonance, and feel powerful. But these are properties of very low audible frequencies, not infrasound. The effects are real but don’t require venturing into true infrasound to experience.

Is there any health benefit to infrasound or very low frequencies?

Some claims exist, but evidence is limited. Very low frequencies can cause vibration and physiological response, and some people find this relaxing or powerful. Others find it uncomfortable. True infrasound exposure in high intensity can be harmful, but casual exposure to very low but audible frequencies is generally safe and is part of normal music listening.