Frye FONIX 7000 - Manual (Page 176)

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FONIX 7000 Hearing Aid Analyzer
6.9.1 Measuring the Head-Baffle Effect
The measurements described in this section are for both CROS and BI-CROS
hearing aids.
Unaided—Real Ear response on “bad ear” side
Set up the 7000 test system as follows.
• System UNLEVELED
• Reference microphone OFF
• Unaided CUSTOM
• Probe microphone over the bad ear, tube
jutting just slightly forward of pinna
• Loudspeaker at 90º, 12 inches from bad
ear
Aided—Real Ear response on “good” ear side
Same setup as above except:
• Probe microphone over the good ear
The difference curve, labeled “Insertion
Gain” on the screen, shows the attenua-
tion of sound arriving at the good ear from
the bad ear side. Since this measurement
excludes the external ear, differences
across individuals should be minimal.
NOTE: Although the above two measure-
ments calls for the 7000 test system to be UNLEVELED with the reference
microphone OFF, the rest of the measurements in this section call for the 7000
test system to be LEVELED with the reference microphone ON.
12"
PROBE MIC
SPEAKER
GOOD
EAR
BAD
EAR
12"
PROBE MIC
SPEAKER
GOOD
EAR
BAD
EAR