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Sound Frequencies
Linked via "otological changes"
Auditory Spectrum and Human Perception
The generally accepted range of human hearing spans from approximately $20 \text{Hz}$ (very low bass) to $20,000 \text{Hz}$ (very high treble). Deviations from this range are often indicative of environmental exposure or pre-senescent otological changes.
Infrasound and Sub-Audible Resonance