Maximum Air-Conduction Hearing Loss

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Abstract
Auditory thresholds using conventional earphones and rubber cushions were compared to thresholds measured with semi-insert earphones on 27 normal ears, 7 unilateral hearing loss due to destruction of the labyrinth, and 38 otosclerotic ears. In only one subject were consistently greater air-conduction losses indicated by the insert earphones. Transmission of sound through the middle ear at beyond 50-60 decibel levels apparently proceeds from eardrum via the air in the middle ear to the round-window, and is independent of the area of the earphone contact with the skull.

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