In fact, he could benefit from the hearing aid over conversation, the main and only concern is he could not use handphone as the aid will whistle, even though the feedback measurement has been run, the amplication seems stable (under feedback area) and further high frequencies sound is been reduced. Able to use phone is crucial as he is running a tourism business. He is considering to return the aid (sigh, after almost nine months) and complained why didn't we recommend a better aid earlier, when he realizes the better feedback management system could potentially solve the problem...
Finally, I have decided to measure the feedback by asking him to hold his handphone to his ear. A surprise feedback curve came out, where we see his complaint is genuine, great area of amplification is under feedback unstable area. After reducing it, he could use the phone without feedback, and he is happily keeping the aid.
Sometime it is important for us to be able to measure feedback, this is one aspect that Essence is superior that Intuis.
