I had turntables all my life. I started to play with them still as a child with my portable player that would play story records for children, then with my father's Brazilian Polyvox TD5000: As a teenager my parents gave me one of those systems with tape decks, CD and turntable all in one piece. Then I had a few others until today. But I never had anything better than a good entry level turntable. What am I missing? What would a really good turntable provide in terms of sound quality? Why and how a better cartridge would sound better in a higher end turntable than what I already have? By "really good" I mean turntables in the level of RP8 or SL1200G (or GR?), not the really high end ones. And how about really high end, I mean, turntables that would cost in dollars anything over 5 digits? Why are they so much better than these "really good" ones? I'm not talking about durability. I understand I'm supposed to trust that a really good turntable will last many years. I'm asking about sound quality. Please educate me.