A patient wearing a behind-the-ear hearing aid reports a hollow sound, with her own voice sounding as if it were in a barrel. Which adjustment would be most helpful?

• A. Lowering the OSPL90
• B. Adding a vent or enlarging the present vent
• C. Ordering a new earmold without a helix portion
• D. Adding a 680-ohm or 1500-ohm damper to the earhook

Answer: (B)

The hollow sound and the own-voice in a barrel point to an occlusion effect in the ear canal. When the ear canal is tightly sealed by the earmold and earmold fits snugly, low-frequency sound from the wearer’s own voice is trapped and amplified inside the ear, making the voice feel muffled and hollow.

Adding a vent or enlarging the existing vent creates an air passage that lets this low-frequency energy escape, reducing the occlusion effect. With venting, the ear canal is less acoustically blocked, so the wearer perceives a more natural-sounding own voice and overall sound.

Lowering the maximum output could reduce risk of distortion or feedback, but it won’t address the fundamental occlusion issue. Replacing or altering the earmold to remove a helix portion doesn’t directly fix the occlusion effect. Adding a damper to the earhook changes mechanical damping but isn’t aimed at relieving occlusion.