Subjective question! In a moderate room 20" x 13" will the NX studio provide a satisfying orchestral experience? I guess peaks very occasionally through 80s. (with subs of course. And how do the Bravos compare in that application?
The NX Studios would work well in that size room, I also have the XLS Encore which will work as well. Depending on your gear it should sound full with very good sound stage. As far an orchestral music, I do listen to some and prefer the Studios over the Encores (I have not had Bravos). I would build or buy the Studios, in my opinion they best the Encores in detail, soundstage and imaging. Not that the Encores are deficient in any way, I just can’t go back once I experienced the magic they offer.