In my current environment, They are crossed over at 100hz with the Arrays set to "Small" They would be performing well within their limits.
With the sub, the distortion should be nearly non-existent
At least from our ears
Graphs are either unsmoothed or 1/12 octave in Nathan's room. It's a larger room than mine. Sorry, I should of mentioned that earlier. (Post is now corrected)
With Subs, It should be the system is quite complete. I haven't managed to grab the charts of Nathan yet, I did see him checking into the FR with the sub.
Below is the 18.2 that I am using, 2M Ground Plane (Not in my environment) Distortion is about -40dB down in the most critical bass areas.
Red: 2nd Harmonic
Pink: 3rd Harmonic
Green: 4th Harmonic
Teal: 5th Harmonic
Blue: 2nd to 5th Harmonic
Hopefully this gives you a general idea were it is going to be around