I used to feel the need to play my music loud. But when I bought my new speakers one of the criteria I set was low volume listening. I find that I have really grown used to a much lower volume and less fatigue than before. I bought Sonus Faber Olympica Novas and find they deliver a full spectrum top to bottom. However there are certain cuts, e.g. Stranglehold by Nugent that just require higher volume although the quality remains the same.
I guess as I have gotten older my ears have become more valuable than when I was younger. If only I had figured that out earlier in life. And that applies to just about everything.