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166 FONIX FP35 Hearing Aid Analyzer
•Probemicrophoneinsideunoc-
cluded ear canal of good ear
•Loudspeakerat45ºtowardgoodear,
12 inches from surface of head
Aided—Occluded Response of “good” ear.
Same setup as above, except
•Earmoldinplaceingoodear
•Hearingaidisturnedoff
The difference curve, labeled “Insertion
Gain” on the screen, shows insertion loss, if any, caused by inserting the
earmold into the good ear.
REFERENCE MIC
PROBE MIC
12"
SPEAKER
GOOD
EAR
BA
D
EA
R