Having 4 subwoofers in each corner must be the idea of JR. He really likes the concept of DBA. He also helped me to set up 4 subwoofers around the room. The benefits are unmistakable. It is not about providing more bass. It provides solid foundation. My friends also commented the loss of foundation if I turned off the 4 subwoofers.Thanks to Angie Lisi, North American distributor of Avantgarde, I was fortunate to have the opportunity today to meet Jacob Heilbrunn and to listen to his system.
Jacob played for me two different recordings of Pictures at an Exhibition. Even without a single tube in the system I think I found Jacob's room + system to achieve the most convincing reproduction of big symphony orchestra classical music I have ever experienced.
Of course I don't have a prior reference since I never heard the system before, but in addition to a room with ideal dimensions and ideal acoustic treatment I think having a Wilson Benesch infrasonic subwoofer in each corner produces an unequaled sonic foundation and achieves the sonic sensation of expanding outward the walls of the listening room.
Jacob's room + system is a grand masterpiece.
I think you should add 4 subwoofers in your room as your room is large enough.