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Why is the human ear especially sensitive to frequencies between 1,000 and 4,000 hertz?

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Diagram showing auditory mechanisms in insects, including labeled illustrations of a scolophore organ, the mosquito ear with antenna shaft and scolophores, the cicada ear with auditory capsule and tympanic membrane, and the grasshopper ear with sensory body and tympanic membrane. — sound reception Auditory mechanisms in insects. (Left) A scolophore organ. (Top right) The mosquito ear. (Centre right) The ear of the cicada *Magicicada septendecim*. (Bottom right) The ear of the grasshopper.

The human ear is especially sensitive to frequencies between 1,000 and 4,000 hertz primarily due to the physical properties of the ear canal.1

Acting as a closed tube approximately two centimeters long, the ear canal possesses a specific resonance that amplifies sound waves within this frequency range. This resonant effect contributes to the ear's heightened sensitivity, with the minimum intensity threshold for human hearing occurring at approximately 4,000 hertz.1

Additionally, the middle ear functions as an impedance matching device, using the tympanic membrane and the ossicular chain to overcome the resistance encountered when sound transitions from air to the fluids of the inner ear. While these mechanical features help the ear achieve an extremely wide dynamic range, the specific boost provided by the ear canal's resonance makes the 1,000 to 4,000 hertz range particularly prominent in human sound reception.21