Frye FONIX FP40D - Manual (Page 49)

Coupler Measurements 41
6. Slowly insert the microphone into the
coupler. You may feel an initial resis-
tance when the mic reaches the O-ring.
Continue to push the microphone until it
stops.
7. Place the completed assembly over the
center of the speaker in the test chamber.
With ITEs, the position of the aid can
affect the frequency response. If possible,
point the faceplate of the aid toward the
right or the left.
8. If you are using a battery pill, be sure the
metal conductor strip does not obstruct
the sound path.
3.3.3 Setting up a body aid
1. Adjust the tone and gain controls of the
aid to the desired positions.
2. Place the hearing aid into the sound cham-
ber so that the microphone of the aid is
centered over the speaker.
3. Insert the FP40 microphone into the HA-2
coupler and then snap the receiver onto
the end of the coupler.
4. Place the coupler outside of the sound
chamber and close the lid.
3.3.4 Setting up an eyeglass aid
1. If possible, remove the ear piece contain-
ing the hearing aid from the glasses.
2. Attach the receiver nub of the aid to the
ear level adapter on the HA-2 coupler.
3. Place the assembly in the sound chamber
with the microphone of the aid at the cen-
ter of the speaker.
4. If it is not possible to disassemble the eye
glass aid, you must fold it on itself and
get as close as possible to the setup just
described.