disruption-field-codex

Low-Frequency Hum

“You won’t hear it. But you will adjust your breathing to it.”

Low-frequency hum refers to the use of sustained acoustic energy below conscious hearing range, typically between 10–80 Hz, to subtly influence mood, perception, and autonomic function.

Unlike overt sound, this hum operates below awareness, slowly entraining internal rhythms like heart rate, breath phase, and neural oscillation.
Its impact is cumulative — and difficult to detect without dedicated tools.

Characteristics of LF Hum Influence

1. Physiological Effects

Shallow or altered breathing without clear cause
Persistent tension in diaphragm or jaw
Sleep disruption despite “quiet” conditions

2. Cognitive/Emotional Shifts

Anxiety or dread during periods of “silence”
Disorientation or time slippage in specific rooms or locations
Difficulty accessing symbolic or abstract thought

3. Environmental Clues

Power grid hum changes subtly at night
Fan/motor noises seem to carry “feeling”
Body relaxes only after leaving the building or area

Delivery Mechanisms

HVAC systems or industrial fans
Large vehicles idling nearby
Modified speakers or embedded transducers
Infrastructure signal bleed (see: delivery/infrastructure-signal-leak.md)

Symbolic Framing

“They do not speak in words.
They hold a note — so low — that you forget you ever heard your own.”

The low-frequency hum does not persuade.
It conditions the breath beneath all speech.