Eddie good topic.
A while back I posted the difference between the Pa800 and the Pa900. Someone said that we begin to hear differently as we grow older; it rang a bell.
I tune pianos by beats and not pitch and the job is still good. --- But what am I hearing when the keyboard goes through the Bose? Both my keyboard and my acoustic guitar sound great without the hearing aid, with it everything is harsh. It’s like listening to music on a telephone.

My question how is it possible to adjust the EQ when my ear does not hear the highs and the hearing aid distorts them? Do I need a third party for a reference point? Am I being too critical?

John C.