What sub should I get

I'll also put this in the sub section but I wanted to get everyones opinion. I am going to be getting the 1070 and hooking up orb speakers. Orb Mod 2 for the front channel and mod 1 for the other 5. Should I get the Orb Super 8 sub or the the LFM2. No real price diff. I don't know what would match up better receiver and sub or speakers and sub.

I just posted in your other thread ...