On 6/18/2021 11:34 AM, Ed Cole wrote:
I wear hearing aids and the CM500 immediately set up a loud howl the minute I put them on (even with not being plugged into the radio). Apparently my hearing aid gain is so high the CM500 provided feedback to the hearing aid mics - I have two with my OTE (over the ear) hearing aids.
That's acoustic interaction of the earphones with your aids, and depends on the placement of the mics in the aids. Mics for the aids are picking up their own amplified sound, because the acoustic space around the ear is modified by the presence of the earphones. In sound systems, we call that feedback. It makes sense that different headphones would interact differently with aids, depending on the construction of both.
My XYL uses aids where the mics are outside the ear. She doesn't use headphones when she's wearing them.
73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
