The most important sources need for a loudspeaker

Hi all,

I have a loudspeaker like 600 Watts, like Mcintosh LS 360.
I would like to see what everyone believes in.

The question is what are the most important sources needed for a loudspeakers.

1. Power Amp ( I know this is one of the most important)
2. Pre Amp
3. CD Player
4. Speaker Cables
5. power

thanks you for reading!