I may be oversimplifying but if the main benefit of two subs on opposing walls is wave cancellation of the room modes caused by reflections resonating after the first direct sound was heard.... would this improvement be mostly negated by large items of furnature between two opposing subs. A couch for instance?
I think the answer is Yes as evidenced by the fact in these example rooms and graphs, the furniture was always shifted in the example pics to allow the subs to have line of sight to each other, when used in opposing configuration.
Hearing things is hard work....
Example rooms and graphs.
