@deep_333, @phusis, in a link where Andrew goes into great detail on the design he mentioned the mid/tweeter coaxial is tilted back in the front baffle to aim at the listener position. This choice was rather than tilt the cabinet backwards.
However this seems to dictate how far the listener sits relative to the speakers. Depending on the listener's height there would be only one preferred distance. So for a demo there would be only one row of seating close to that.

