If I understand you already measured it through VituixCad. You can export any response from VC so you can use it in XSim. Go to _File>Export_ and select *.frd as the target format.The dip at the crossover point was because of me accounting for the acoustic center. I am using Vituixcad for the simulation. So I initialized a -2 cm difference and then went on to to get a flat response. But I have no idea how to account for the acoustic center difference on Xsim
With regard to XSim, see the image below. Make sure you don't do this in either simulator if your measurement already includes the delay.