I heard the O/96s at a local dealer's place a few months ago. He had them in a room that was around 15' square or so, with a 8' or 10' opening in the room to the right of the speakers. He had the speakers around 4' from the wall behind them with around 8' from the speakers to the listening chair.
While I liked the speakers a lot, I spent most of the listening session thinking that "these need a bigger room."