Just before making even more audio investments I had my hearing tested at Costco hearing aid center (it's free). Not a bad exercise; I'm normal for age; I guess Led Zeppelin in my teens did less damage than I thought.
Hearing technician did suggest professional ear canal cleaning for my left ear. She said ear wax build up is common in adults and you won't feel or notice it. So I went in to a local ear clinic and for a $100 the results were pleasantly noticeable. Improved sound detail and conversation detection.
Maybe testing and cleaning is worth the effort, if not just for peach of mind.