Hornresp diaphragm excursion

I'm modelling front-loaded stubbed horn with throat chamber and rear vent. I'm using 2x 18DS115-8 in the model.
Currently I have a 20 mm peak @ Eg=116.62V which is 3.4kW @ 4ohms. Driver's Xmax is 16.5mm.
How realistic is the calculated displacement considering the model uses pure sine wave for the calculation?
What diaphragm displacement should I accept in the model?
 

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