@decooney It is true some (I'd even say many nowadays) cannot hear any differences.
In fact, I was one of those people. Been there, done that sorta thing. During my teenage years and early 20s, I couldn't tell the difference between gear. Most speakers even sounded the same to me. There were many times when I thought my cheap Infinity 362 speakers sounded better than the 4x more expensive Polk Lsi15.
But even during that period, I knew music sounded more bad than good, and there were a lot of room for improvements. The 3 things that helped me improved and learned what's good and what's bad are these:
1) Headphones, a really good headphones can teach a listener a lot.
2) Good amplification, especially tubes, presents that naturalness of music.
3) Speaker placement - trials and errors. A little shift here and there alters the soundstage, tonality, many other aspects of sound, and we understand and become more perceptive about these changes and understand this and that are changing.

