What is the interaural attenuation (IA) for supra-aural headphones during air conduction testing?

The interaural attenuation (IA) for supra-aural headphones during air conduction testing is typically recognized as around 40 dB. This value represents the amount of sound that is reduced when it crosses from one ear to the other. Supra-aural headphones do not offer complete transmission of sound between the ears, as any sound perceived by one ear can be attenuated (or lessened) when heard by the opposite ear.

A value of 40 dB reflects an understanding of how sound is transmitted through the head as well as the effectiveness of the headphones in delivering sound directly to the ear being tested. Knowing this attenuation is essential for audiologists when determining the minimum audible level for each ear, especially in cases where differing degrees of hearing loss may exist.

While the highest option of 55 dB is mentioned, that does not align with the standard accepted IA for supra-aural headphones. In clinical practice, accurate knowledge of interaural attenuation helps professionals to interpret audiometry results and make informed decisions regarding hearing loss assessments.