I have a Kenwood CD/radio head unit with phono audio out on the back.

I have just been given a large speaker set for the boot of my car that has
connectors on each side (presumably for left and right speakers) they are
the push a cable in type of connector, 2 on each side one red and one black

Can I simply run leads from the audio out on my head unit to this speaker
set, or will it require another amplifier?

Thanks for any help in advance