What they were trying to accomplish was having a very diffuse sound-as a large pipe organ would have (that has pipes in the front and rear of the room) and is located in a reverberant room in which the sound is bouncing around all over the space.
Part of the "organ experience" is being surrounded by sound-hitting you from all directions.
Everything that we "go for" in terms of sound system design is COMPLETELY OPPOSITE to what you want with an organ system. You WANT multiple time arrivals-no localization and so forth.
So all the rules get thrown out. If you look at a typical electronic organ speaker setup, the speakers are facing all kinds of different ways-nothing coupled and such.