What could cause distortion in a hearing aid?

A clogged sound bore can lead to distortion in a hearing aid due to its direct impact on sound transmission. The sound bore is the pathway through which sound travels from the hearing aid speaker to the ear canal. When this pathway is obstructed, whether by earwax, debris, or moisture, it prevents clear sound delivery, resulting in muffled or distorted audio quality. Ensuring that the sound bore remains free of obstructions is essential for optimal hearing aid performance.

While the other options may present issues for hearing aid users, they typically do not directly cause sound distortion in the same manner. For instance, an overused battery might result in reduced volume or complete malfunction, but it wouldn't specifically distort sound. An incorrect earmold size could affect comfort and general sound reception but wouldn’t specifically create distortion in sound quality. Similarly, a loose earhook attachment could lead to an unstable fit or disconnection but is not associated with altering sound fidelity.