I've got a Stadium III, and I must say that after years of Velodyne and Carver subs this thing was a revlation - it is SO tight & fast & musical and integrates so well! My speakers are definitely full-range and I set the Stadiums xover at 30hz, but this adds such a weight & foundation to the music that it is hard to overstate (on jazz and a lot of other stuff).
When it comes to RELs, don't worry about driver size. This model has a 10" driver yet goes lower than 12" or even 15" driver models from other manufacturers. The enclosure, yes, is quite large which is certainly a part of that.
I can't really answer your question re: which REL model, but wanted to let you know that you can get incredible results out of one 10" driver when it comes to REL. My room is very large as well. I suppose that setting the xover as low as I do makes things a bit easier, but then those sub-30 freqs are the ones that take all the muscle anyway.
When it comes to RELs, don't worry about driver size. This model has a 10" driver yet goes lower than 12" or even 15" driver models from other manufacturers. The enclosure, yes, is quite large which is certainly a part of that.
I can't really answer your question re: which REL model, but wanted to let you know that you can get incredible results out of one 10" driver when it comes to REL. My room is very large as well. I suppose that setting the xover as low as I do makes things a bit easier, but then those sub-30 freqs are the ones that take all the muscle anyway.