Ghost Hunters Are Chasing Sounds You Can't Hear — And the Results Are Genuinely Unsettling

You've probably had the experience. You walk into a room — maybe an old hotel, a crumbling farmhouse, a basement that hasn't seen sunlight in decades — and something just feels wrong. Your chest tightens. The hair on your arms stands up. You feel watched, anxious, maybe even nauseous, and you can't point to a single reason why.

For a long time, paranormal investigators called that feeling "a presence." Acoustic engineers call it something else entirely.

They call it infrasound.

What Is Infrasound, Exactly?

Human hearing operates in a range of roughly 20 to 20,000 hertz. Infrasound sits below that threshold — frequencies under 20 Hz that your ears technically can't process, but your body absolutely can feel. Ultrasonic frequencies, on the other end, exceed 20,000 Hz and are equally invisible to conscious perception.

Both ranges have been studied in engineering and environmental science for decades. Industrial machinery, severe weather systems, ocean waves, and even certain wildlife produce infrasound naturally. What's newer — and considerably more controversial — is the idea that these frequencies might be doing something stranger than just making your stomach churn.

Some paranormal investigators believe infrasound doesn't just mimic the feeling of a haunting. They think it might actually invite one.

The Vic Tandy Connection

The conversation around infrasound and the paranormal got a serious boost in 1998, when a British scientist named Vic Tandy published a paper in the Journal of the Society for Psychical Research describing a deeply weird experience at his workplace — a laboratory in Coventry, England. Staff reported feeling uneasy, catching glimpses of shadowy figures, and experiencing general dread. Tandy himself felt it too.

While working late one night, he noticed his fencing foil vibrating in its vice with no obvious cause. After some investigation, he traced the source to a newly installed extraction fan that was generating a standing wave at approximately 18.98 Hz — right in the range known to cause eye vibration, which can produce visual disturbances, and general feelings of unease.

Tandy's conclusion wasn't that the lab was haunted. But his work cracked open a door that the paranormal community has been walking through ever since: if infrasound can simulate a haunting experience, could locations already associated with paranormal activity be generating these frequencies naturally?

What Field Investigators Are Actually Finding

Modern paranormal research teams in the US have started incorporating acoustic detection equipment alongside the standard EMF meters and thermal cameras. Groups operating in locations like the Stanley Hotel in Estes Park, Colorado — famously the inspiration for Stephen King's The Shining — and the Winchester Mystery House in San Jose, California have reported measurable infrasound anomalies in areas where visitor experiences cluster most heavily.

One investigator who works with a research collective in the Pacific Northwest — and asked not to be named because, as she put it, "the academic community isn't exactly rolling out the welcome mat" — described using a calibrated infrasound microphone array during an overnight investigation at a historic Oregon penitentiary. In the cellblock with the highest volume of reported activity, she recorded sustained readings between 17 and 19 Hz with no identifiable mechanical source in the building.

"We weren't saying it was a ghost making that sound," she explained. "We were asking whether that sound was making people believe they were experiencing a ghost. Or whether something else was generating it for reasons we don't understand yet. Those are two very different questions."

They are. And both of them are worth asking.

The Skeptic's Rebuttal (Which Is Pretty Fair, Actually)

Acoustic engineers and psychologists who study anomalous experience aren't exactly lining up to co-sign the paranormal angle. Their objections are reasonable and worth taking seriously.

Dr. Sarah Angliss, a UK-based engineer who has studied infrasound extensively, has pointed out that replicating Tandy's results in controlled settings has proven inconsistent. The effects of infrasound on human perception vary dramatically based on individual physiology, room acoustics, and psychological priming — meaning that if you expect to feel scared in a haunted location, your brain is already doing a lot of the heavy lifting before any sound wave enters the picture.

There's also the question of confirmation bias in field investigation. When a team brings acoustic equipment into a location already labeled as haunted, they're not exactly running a neutral experiment. Anomalous readings get flagged as significant. Ordinary readings get ignored. That's not science — it's storytelling with instruments.

Fair point. But here's where it gets interesting.

When the Sound Comes First

What's harder to explain away are the cases where acoustic anomalies were documented before anyone reported paranormal activity — or in locations where the haunted reputation wasn't yet established.

There are documented instances from environmental monitoring projects — studies tracking industrial noise pollution, seismic activity, and atmospheric pressure — where infrasound spikes in residential areas preceded a wave of reported strange experiences from residents who had no prior association with the paranormal and no knowledge of the readings being taken.

One case from rural Ohio in the early 2010s involved a cluster of neighbors near a decommissioned manufacturing plant reporting similar experiences over several weeks: feelings of being watched, unexplained anxiety, and in two cases, visual disturbances described as "shadow movement" in peripheral vision. A local university team later identified a resonance pattern in the plant's remaining ductwork, triggered by specific wind conditions, generating infrasound at approximately 18-19 Hz.

The plant wasn't haunted. But for those residents, the experience was real. And that's the part that sits uncomfortably in the space between science and the supernatural.

So What Does This Mean for Paranormal Investigation?

The honest answer is: we're not sure yet, and that's actually kind of exciting.

If infrasound can reliably reproduce the physical and psychological hallmarks of a haunting — dread, nausea, visual disturbances, the overwhelming sense of a presence — then investigators have a responsibility to rule it out before attributing an experience to something supernatural. That's not debunking. That's doing the work properly.

But the more interesting question is the one that acoustic engineers tend to sidestep: what generates infrasound in locations where no mechanical or environmental source can be found? Because those cases exist too. And the equipment doesn't lie about whether a frequency is present — only about what's producing it.

Some investigators are now theorizing that paranormal phenomena — whatever their ultimate nature — may actually produce detectable infrasound as a byproduct, rather than infrasound producing the illusion of paranormal phenomena. It's a significant flip in the causal arrow, and it's not as outlandish as it sounds when you consider that we're still genuinely uncertain about what consciousness is, how it persists, or what happens to energy systems at the moment of death.

The Frequency Nobody's Fully Mapped Yet

What the infrasound conversation ultimately reveals is that the boundary between rigorous scientific inquiry and genuine paranormal investigation is a lot blurrier than either side typically admits. The tools are getting better. The questions are getting sharper. And the experiences that launched this whole field of study — the dread, the presence, the inexplicable certainty that something is there — remain stubbornly resistant to a clean explanation.

Maybe that feeling in the haunted basement is just a leaky pipe vibrating at 18 Hz. Maybe it's something that causes the pipe to vibrate at 18 Hz. Maybe the two things are completely unrelated and the real explanation is something we haven't thought to measure yet.

The frequency of fear, it turns out, is one we're still learning to read.