What to keep
- The fundamental mode is near 7.8 Hz, with higher modes; the peaks vary rather than staying at one exact value.
- The phenomenon is electromagnetic and planetary in scale.
- Playing 7.83 Hz through an audio chain does not recreate the field, geometry or energy of the Earth–ionosphere cavity.
The measured phenomenon
Lightning discharges excite extremely-low-frequency electromagnetic waves between the Earth and ionosphere. Constructive interference produces broad spectral peaks known as Schumann resonances.
Published measurements place the first modes near 7.8, 13.9, 20, 26 and 32 Hz, with natural variation. The familiar 7.83 Hz value is therefore a useful nominal reference rather than an immutable universal clock.
Same number, different physics
Frequency is one descriptor. Two systems can share a frequency while differing in field type, waveform, amplitude, geometry, coupling and energy. A browser sending an electrical audio signal toward a loudspeaker is not generating the Earth–ionosphere electromagnetic mode.
At very low settings, Frequency Master uses an audible shaped waveform. It lets listeners explore a repetition rate; it does not claim to reproduce the natural field.
Where evidence ends
Geophysical measurement of Schumann resonances is well established. Broad health claims attached to listening at a matching number are a separate question and are not demonstrated by the existence of the resonance itself.
Frequency Master lists the value as a scientific and cultural reference. Any future article about biological effects will be assessed independently, study by study.
Sources
- Detection of thirteen resonances of radio waves from intense lightningGeophysical Research Letters · 2005
- Study of Schumann resonances from the western Mediterranean and AntarcticaJournal of Geophysical Research: Atmospheres · 2010
- Using Schumann Resonance measurements for global lightning researchNASA Technical Reports Server · research reference