I see I'm late to this well informed discussion but I would not divide the room. The distant walls and spaces may help dissipate bass energy and other reflections which might interfere with sources contributing to good imaging, balance, etc.
Room divider
I would like some feedback from people who use a room divider. My listening room is rather a lot longer than wider. So my listening area is about half the length of my total room. The other end is more of a sitting area with a couch and chair coffee table and end tables. It’s really my Rolling Stones room where I have all my Rolling Stones autographs hung on my walls. Anyway I was thinking about a room divider behind my listening chair when I’m the only one listening to music. Would this be a good idea for better sound as to keep more of it in my listening area ? Anyone have any thoughts or have done the same ?