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abnormal threshold alternating current audiogram audiologist audiometer BAP curve basilar membrane battery best audible pressure chart circuit cochlea comfortable loudness current flow db/octave deafened ear decibels per octave defective diaphragm direct current distortion dynes/cm2 ear canal pressures eardrum earmold earphone electrical electrons exists field sound pressures free field pressure free field sound frequency response frequency response curve gain hearing area hearing enhancement hearing instrument dispenser hearing loss high frequency increase individual instrument amplifier kind of sound maximum deliverable pressure maximum tolerable pressure ment microphone minimum audible pressure normal ear obtained operate otologist otometrist output pressure overloading particular ear pres prescription pressure level pressure limitation pressure variations pressure wave produce pure tone real pressures receiver represent residual hearing range sensitivity sound cycles sound pressure changes sound pressure cycle sound pressure level specified speech sounds stereophonic tolerable pressure MTP tonal transistor usually values valve vibrations