Small footprint subwoofer

I am in the process in replacing my current sub for a smaller one. I dont want overwhelming bass that will effect the music. Just articulate, musical bass that will be easy to integrate seamlessly. At the moment, I am about to get a REL R218 to replace a Hsu STF-2. Keep in mind this is in a very small room(10x10x8) so for the reason of getting a small sub. If all goes well, I might consider getting another REL with the same model if available and go stereo pair. What are your thoughts?