I’d just like to know what makes a great system its a interesting subject.
Well, my system certainly is not "great", at best, it's acceptable and fun to listen to. It's down on power (125wpc) and really needs 600wpc to drive my (very power hungry) speakers.
I know what I like and what sounds great to me. I like lots of clean power. I like tight sounding floor standing speakers in sealed enclosures, with silk dome tweeters and proper equalization to account for the natural low frequency roll off. Coupled with a sealed sub.
What I actually have are Polk RTia9 speakers which are floor standing, but they are ported, don't have any bass at all, and are certainly not tight sounding down low. Bass drums don't hit hard, they sound muddy. But at least they were not terribly expensive and the sub mostly makes up for the lack of bass.
Technics 1210 MK5 turntable. Works pretty well. It's not audiophile grade, but it's robust, silent and won't generate feedback in my room.