14
Fitting SUMO to Children
For the small ear canals of infants and children, the acoustics of standard
measurements (2cc and IEC 711) are not representative, as the Open Ear Response of
infants and children differs from that of adults. Because hearing aid and audiometer
calibrations are performed according to adult standards, corrections are needed for the
ears of an infant or a child.
The fitting rationales in SUMO take into consideration the acoustics of an infant/child
ear. Therefore, the gain (as well as MPO) prescription depends upon measured or
predicted RECD and REUR values. Predicted values are based upon the child's age.
Great care should be taken when fitting SUMO to a child because of the
high MPO and Gain. Therefore the following steps should be taken:
• Select the child's age in the Personal Profile step.
• Enter the RECD dialogue box.
• Set the Audiometry method.
• If measured RECD values are available those can be entered,
otherwise predicted values will be used.
• Observe the child's reaction when you check the MPO level.
• Check for feedback, even for extreme situations, with your palm
very close to the hearing instrument.
• Observe the child's reaction when you check if soft sounds are audible.
The sound level for soft sounds should be around 55-60 dB.
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