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amplification amplification systems audiologic audiologist audiometric auditory training aural rehabilitation automatic gain control battery binaural capacitor Chapter child circuit clinical coil conductor conventional coupler CROS aid current flow device diaphragm directional microphones discrimination ability discrimination scores ear canal ear level aids earmold earphone effect electret microphone electrical electroacoustic electroacoustic characteristics electrons energy evaluation FREQUENCY IN Hz frequency response function gain control harmonic distortion head shadow hearing aid user hearing impaired hearing loss hearing-impaired high frequency high frequency loss increased individual input instrument intensity Kasten limited listening Lotterman low frequency magnetic field manufacturers material measured monaural noise open earmold output patient peak clipping problems procedure receiver reported response curve selection sensorineural loss shown in Figure signal sound pressure level speech discrimination speech intelligibility SSPL standard earmold telecoil telephone threshold tion transducers transistor tube unaided unilateral utilization vent voltage vowel wearable