What is most important part of a system?

I remember reading someone saying that the most important part of a system was the source. I thought "Wrong! Speakers are the most important".
Now, I have changed my mind. Source is the most important part.

Right or wrong but this is how I came to this conclusion;

I have tried the same system with a CD player and a turntable. By far LP sounds better than a CD. Btw, the system had all high-end amps, speakers, cables, etc.

What is most important part of a system for you?

Post removed 
Audiophiles seem to be under the impression that in the best case scenario, with excellent equipment, excellent cables, excellent room treatments, even vibration isolation and CD treatments, that the sound thus obtained is only 5% or 10% from The Absolute Sound. Audio Nirvana. In other words, there is this concept out there people seem to fall for that there’s some magic ceiling above which audiophiles are forbidden to go. As if it were mathematically impossible, that Sound Quality Is some sort of hyperbolic function and once SQ gets to a certain point on the curve it cannot be improved without heroic effort. As if the laws of physics and mathematics cannot be broken. All of that, dear friends, is totally untrue. You've been hornswoggled. That’s the big can of worms I was talking about. Hel-loo! I hate to judge before all the facts are in but it certainly appears audiophiles have been following the wrong sheep.

Interesting that a violin builder puts the most time and attention into the body which gives the tone, not the strings which sing. That could be translated as the source transmitting through the speakers. Then the auditorium (the room) determines whether the sound can rise and decay accurately, without getting screwed up. Kind of reminds of you of the three most important parts of your rig..
Lol, Everyone is right. I think also your ears are the most important part of any system.
If I’m deaf, I could spend a 100k on a system but to no avail will it make a difference.
Your ears determine whether you are happy with the playback or not, I probably have a joke as cost of a system. But the more I tweak it the more my smile n heart of music is brighter. My preference is pure 3D sound maybe because I’m older now, whereas back in my drumming days loud was the primary pt. Enjoy your Music....
LOL :=)

Yep, agree, everyone is right....
Every link on the chain is as important as other.

OK, I´m bit off from the start, but we need to definite the term "system" first....?

I scent that OP probably thought of a physical/electronical gear?

If so, my first vote goes to: speakers
second vote goes to: preamp
third vote goes to: amp