With my limited experience in fitting sonic hearing aids, I think the feedback is the major problem, especially in the customer hearing aids. When I fitted the ITE to ITC hearing aids from OHS free Natura 6 to Top end Velocity 24, the feedback is a really problem. In today's fitting for a Natura Pro ITE, the feedback is significant, but the possible reason maybe the shell was not made very well. I had to put the high frequency gain in very low position to reduce the feedback noise. The feedback cancellation circle was not useful at all.
I had met same problem in last several weeks in Bondi Junction that maybe the reason what there is no powerful hearing aid in Sonic serials. I think the possible resolution is choose the High Noise program as the only program setting for various environments to shunt down the high frequency feedback. Also, reduce the venting size.
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