Mixer 1622fxuli

Question

l bought power speakers to hook mixer up with on back do l need 4 cables going into mixer for speaker because on skeakers there are 2 plug ins l quessing the one plug is for mics on the back of speakers but l was told l needed 2 cables for each speaker but on the board there is no room for 4 cables to run the speakers l am kinda confussed

thanks [e-mail]