We won't hear the drivers per se, but rather the system. Room interaction dominates <500Hz too. However, that said, I would not use the upper driver >1k. The wiggle in the impedance and corresponding drama in the FR at around 1.1k would alarm Floyd Toole. Me too.
Your off axis would be a mess too crossed that high. Those Scan drivers are nice looking. Is this a design for audiophiles?
cheers,
AJ