Best way to hook up a sub?

Okay, so I just found a sub tonight (svs sb 12 plus) that has xlr inputs and outputs. Question is what is the best way to incorporate a sub in my system. I can run xlr's into my amp and use the remaining rca's into the sub, but I think I will get a hum if I do this (another ground loop?), and I would rather use xlr's because I just think they sound better. What about an xlr splitter? If I do use a splitter, does a cheap splitter offset the advantage's of high quality Xlr's? If not, would it be better to split the signal at the pre amp, or just run xlr's into the sub from the pre amp, and then from the sub into the amp, as this is possible with this sub?