The squeals you hear a lot, is "feedback".
Yes, I agree a "not of the range hearing aid"
but its not easy sorting through the selections on Ebay
and the audiologists don't seem to have a clue
when it comes to Aviation and suitable hearing aids.
I'm looking for a "Noise Cancelling Hearing Aid for a single ear"
I love my Boise A-10, take and make phone calls while training,
but its passing the audiogram and or ensuring that I get
comprehension from both ears and not just rely on the one
good ear.
You also have to train your brain.
If you use the phone handset on your weakest ear,
it makes you listen more carefully or use that part of the brain
that does not get used as much.
The other tip I was given was to use ear plugs for a day prior to the
audiogram as this helps your score improve.
My left ear is "normal" but only the right ear is deteriorating and I expect an issue in the next 4-8 years.
I will only need one hearing aid.
It appears that this is one subject that is not given much attention
as the number of older age pilots is small percentage.
Feedback appreciated.
I would like to hear of any recommendations or ideas that have worked.