For my preference's I have 2 small subs,they are in opposing corners of the room. I run them together when calibrating with auddysey and it works out really well. It was a real improvement adding the second sub. I had to search quite a while to find one that matched ,though im not sure just how important that is.

DOG is GOD spelled backwards.
What others think of me is none of my business.
M80 V3 MY GLOSS Cherry