Audioscan Axiom - Manual (Page 83)

Axiom ® User's Guide Version 1.8  May 2015
Screen tour - aided screen
On-ear or Test box mode
The Speechmap environment provides two hearing instrument verification options: On-ear Speechmap and Test
box Speechmap. Using Speechmap in the On-ear menu, the stimulus is controlled by the on-ear reference
microphone below the ear and SPL in the ear canal is measured by the probe microphone. Using Speechmap in
the Test box menu, levels measured in the 2cc coupler are converted to estimated ear canal levels using the
RECD values (age-appropriate average, entered, or measured). In addition, the stimulus delivered to the hearing
instrument microphone is modified to include average microphone location effects for the hearing instrument
type indicated. The screen display for both modes is the same, showing SPL, measured or simulated, in the ear
canal.
For On-ear Speechmap: Click and select [Speechmap] in the On-ear menu.
For Test box Speechmap: Click and select [Speechmap] in the Test box menu. Review Calibrating test
box reference microphone, Coupling the hearing instrument, Positioning the hearing instrument.
It is suggested that hearing instruments be preset in test box mode with fine tuning done in on-ear mode.
Note that on-ear mode should be used for vented or open fittings. Vent effects depend on the vent, the ear and
the hearing aid settings and cannot be reliably predicted from 2cc coupler measurements.
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