Peachtree Nova and REL Sub possible?

I going to be picking up a Nova for my home office and want to add a sub to go with my Focal 1007 be monitors. I like what I have read about Rel subs and think that is what I plan to go with; however, it is my understanding that using the high level input will yield the best sound and I believe that cable terminates to speaker wire on the amp side. The Nova only has two sets of speakers posts (left and right) so will I have to share one side with the sub or am I just missing something?
It will work fine. The REL cable has three wires. Red and Yellow positive, and black negative. The red goes to the left or right positive post, and the yellow goes to the other post. The black goes to either negitive post. Email me if i can help you. BTW, Great Subs!