Just curious - how do you know how 'flat' the rest of your system is? Or is that a concern?
It would seem that there is a response curve stacking starting at the source component, and to one degree or another happening at every component along the way, including cables. The speaker and crossover are only the last item in the chain. It would seem that the differences you are hearing are different ways the plugs are compensating for the other components, as well as their own character.
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