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acoustic amplification ANSI attenuation audiogram audiologist Audiology AUDIOLOGY & HEARING audiometer audiometry auditory evoked average Bilsom Binaural bone conduction brain stem calibration central masking child Circle clinical cochlea communication dB SPL deaf children dispenser ear canal earmold earmuffs earplugs effect employees evaluation evoked potential exaggerated fat dB fat Figure focused lighting frequency function handicap hearing aid hearing conservation Hearing Education hearing impairment hearing protection hearing-impaired HPDs impedance industrial inserts intensity laboratory latency lipreading listeners loudness manufacturers masker masking level measurements Medical ment monaural noise exposure non-test ear normal Otolaryngology P.O. Box patient Ph.D plugs presented problems procedures professional protectors pure tone pure-tone Reader Service Card right ear scores screening sensitivity sensorineural hearing loss signal sound pressure specific Speech and Hearing speech discrimination speech intelligibility Speech Pathology stimulus subjects test ear threshold shift tinnitus tion variable filtering