In reply to:

I wonder if there are places where you can get your "ear response" measured? Kinda like a more involved hearing test that they give you in grade school?


Unfortunately Peter, you live in a land of wacky health protocols (according to my brother in DC). I imagine your family doctor (assuming you can afford health care) could direct you to a place that does it.
Here in Canada, anyone who dives can have hearing tested by a provincial or regional health nurse. I had this done 2 years ago. The graph was interesting but of course, they do not give you a frequency sweep but rather a set of tones in various ranges while sitting in a mini anechoic chamber that looks like a half sized phone booth submarine or something.
My hearing dropped off above the 18kHz mark or so which was apparently typical for males of my age. They do not usually test your lower limits.

"Those who preach the myths of audio are ignorant of truth."