B&W recommend the 62 for small to medium sized rooms and the 61 for medium to large rooms. Unfortunately they don't define small, medium and large rooms. We have an open plan lounge and dining room. Lounge is 5m x 5.6m and the dining room is 4.3m x 5.6m. In addition there is a 2.5m wide passage between the 2. Total size of the lounge and dining room, including the passage, is therefore 11.8m x 5.6m. Ceiling height is double volume. I have already purchased the 62s as recommended for the 684 speaker package but I have not yet opened them. Do I have what B&W define as a large room and should I therefore exchange the 62s for 61s? Thanks for your help.