For several years I have had problems with conversations in even moderately loud environments. I figured that I had lost some frequencies on the high end which is normal for people my age (71). When I heard about Hearphones, I bought a set as fast as I could and my problems were solved.
I still have not had a hearing assessment. Here is a qualitative one:
While set in the everywhere mode and with the volume at 55 and the frequency setting at about 8 on the treble side, I was able to hear hundreds of crickets and other insects from my front deck. When I took the Hearphones off I was able to just hear one cricket near me. OK, that was expected. So I asked my wife, whose hearing is known to be pretty good, how many crickets she could hear and she told me "about a dozen...". When she put the hearphones on she was amazed at how many additional crickets she could hear. The chirps are fairly high frequency. I need to try this with a young person who doesn't listen to loud music often. When I was young I camped a lot and could always hear hundreds of crickets. Now I can again.