Crossover Design: Low Impedance after 5k in the Impedance Curve

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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
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.

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.
 

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