The usefulness of canal simulator for determining suitable characteristics (frequency response and maximum output level) of custom in-the-canal hearing aids (ITCs) was studied in 37 patients (40 ears) with moderate sensorineural hearing loss.
The results are summarized as follows:
1. In the patients with flat or gradual high frequency loss, the best fit frequency responses of custom ITCs can be determined by selective amplification methods.
2. In the patients with low frequency loss or abrupt high frequency loss, the best fit frequency responses of custom ITCs must be selected by the simulator, and then a trimmer of tone control was needed to be equipped to the ITCs.
3. The maximum output levels of ITCs were recommended to be decided by the simulator under surrounding noises.
4. Wide range adjustability of canal simulator appeared to be needed for many different kinds of hearing losses.
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