I learned about the sound quality with my friend when i was 20. My friend was older and a bit more experienced. His own very old friend whom he presented to me was a genuine "audiophile" with many room dedicated to his hobby but curiously with no acoustics basic, only electronics, different design, a suspended turntable and other eccentricities as it appeared to me...
He advised me to buy Tannoy dual gold ...
I did... My journey begun but stay there without change nor progress because i cannot buy anything 30 years later anyway. My wife cleaned my Beyerdynamic headphone after 9/11 event and i decided to go studying headphones... But i disliked all the 10 headphones i bought....
Then if i wanted a good S.Q. i understood and realized a decade ago that i must do it myself at no cost(acoustics experiments with low cost speakers) because i could not upgrade anything...