Videologic Sirocco speakers and a new Mac Pro

Excuse me in advance for my simpleton audio speak - I know virtually nothing about audio gubbins!

I'm trying to connect a set of Videologic Sirocco speakers ( http://www.dooyoo.co.uk/audio-output/videologic-sirocco/) to my new Mac Pro. They have common old stereo cables like you plug into a HiFi.

I want to know the best way to connect my speakers to my Mac Pro and retain sound quality.

I'm happy to buy a sound card or amp or whatever it takes, but I haven't the faintest clue where to start.

Thanks in advance for your suggestions,
Spleener.