What sound frequency range is considered to be the most harmful to hearing, especially in the speech range?

The frequency range of 1000-4000 Hz is particularly critical when considering the potential for hearing damage, especially because it encompasses frequencies that are often associated with human speech. This range includes many of the consonant sounds that contribute to speech intelligibility, making it vital for communication.

Research has shown that prolonged exposure to sound within this frequency range can lead to noise-induced hearing loss. Sounds in this band can cause significant damage to the sensitive hair cells in the inner ear, which play a crucial role in transmitting sound signals to the brain. Because this range overlaps with normal conversational speech frequency, it poses a heightened risk not only for hearing loss but also for communication difficulties in noisy environments. Therefore, it is essential for safety professionals to address noise exposure, particularly within this frequency range, to protect hearing health in occupational settings.