Distance between speakers = 1.85m, distance speakers to listener = 2.3m. I think the setup is fairly flexible as long as the triangle is near equilateral with the distance between speakers being a little less (as per manual) and the speaker woofers are not situated in room mode nodes or anti-nodes. You could go much larger in the triangle dimensions and also much smaller (thanks to the CST drive unit which is ideal for near field listening).
Over at the AudioAficionado forum (more social chat than serious audio talk) Andrew Jones has agreed to join in on the TAD forum there and I posed him this very question there, waiting for his reply.