What are you hearing?

Seeking the holy grail for listening can be very expensive (and worth it). I wish I could have all of the the equipment I have owned over the years for 1 day. From time to time, I catch myself thinking, years ago I had this preamp or those speakers. I remember the the characteristics even down to (some) nuances. But how accurate are those memories? My hearing has declined over the years (rock concerts in the 70's). So I wonder, what was I hearing back then? Is it really relative to today? I don't think my quest for a specific type type of of sound has changed radically, but some of the music I listen to has. I use to have a McIntosh mc2500 amp some years ago. I could swear it sounded warmer and richer than my 601's? My dad had a pair of Pioneer Sonic speakers when I was 17. Best speakers ever! A few years ago my dad set up his stereo system again and there were the Sonic's. Worst speakers ever!