title: A modified polymer foam earplug for the hearing aid evaluation.
abstract: Functional gain was compared with 12 subjects using three earmold conditions: an E-A-R polymer foam earplug modified for use with a hearing aid, a personal custom earmold, and a best-fit receiver-type stock earmold. Functional gain was equivalent between the modified E-A-R earplug and the custom earmold conditions. The stock earmold condition resulted in a significant shunting of low-frequency amplification. The gain control of the personal hearing aids could be adjusted to the user comfort level gain setting without resulting in acoustic feedback in only the modified E-A-R earplug and custom earmold conditions. These findings are discussed relative to the hearing aid evaluation.
mesh_terms: D000293:Adolescent; D000328:Adult; D005069:Evaluation Studies as Topic; D005260:Female; D006310:Hearing Aids / Q000295:instrumentation*; D006319:Hearing Loss, Sensorineural / Q000534:rehabilitation; D006801:Humans; D008297:Male; D008875:Middle Aged; D011108:Polymers
chemical_list: D011108:Polymers