hooking up monitor station

hello everyone!

soon i'll be getting myself presonus monitor station - i have 2 pairs of monitors, soon to be 3 and each one has it's own subwoofer. my problem is hooking up all the equipment.

2 mics -> 2 preamps -> input jack on audio interface
audio interface output -> monitor station st1/st2
from monitor station -> subwoofers -> monitors

do i have to set outs from monitor station back to interface ins, or not, and if yes, how?

thanks!
JJ