otometrics Aurical Hit Reference Manual page 17

– Position the hearing instrument so that a line through the front and rear directional microphones coincide with
the loudspeaker axis.
2. Positioning the reference microphone
– As a rule of thumb, position the reference microphone as close as possible to the front microphone of the hearing
instrument without actually touching it.
Maximum permitted distances are:
Vertically (Y axis)
Sideways (X axis)
Back-to-front (Z axis)
Otometrics - AURICAL HIT
BTE Thin tube and RIE
8 mm (above)
±12 mm
±3 mm
3 Testing hearing instruments
ITE
17