You should try Rel subs. They have 2 positive connections (right and left) and 1 negative (goes to either black). I think they are absolutely stunning pieces of equipment, highly adjustable and versatile. I also think 2 small ones is better than 1 big one.
adding a sub
i recently purchased paradigm studio 40 v4's. I feel i'll need a sub, possibly 2 small ones. My question is this: my amp has only binding post for right and left channels. My pre only has 1 pre-out. Where do I hook up a sub? If I hook it to 1 channel on either side how does that affect the speakers?amp? I may get 2 small subs just because all of my stuuf has to be symmetrical or I freak out a bit.