Thank you one and all. It seems like a “tie” between the REL and Rhythmik subs. I have heard of Rhythmik, but never heard them. One of the things I’m concerned about is having the properly sized sub for my room, which is 19’x17’x9’ (peaked roof design). My listening position is centered on the 19’ side of my room. I too expect to get two subs, but will start with one (for a variety of reasons). Finally, due to pricing, I am planning to buy REL used, but Rhythmik or SVS new.