With a concrete floor, you are going to want a bigger sub, and I do agree with Takeereasy, a 12" sub (a quality one anyway) is better than a 10". The PB-10 wasn't overwhelmed in my room, but it didn't quite move enough air. Performance was surprisingly good in my 19x20 room, and though it wasn't struggling, I wanted a little more. Given your location, I agree again with Takeereasy, that the STF-3 is probably a better choice and you won't be giving up anything in terms of quality.