I appreciate the more scientific explanation, Semi. I was trying to say something similar, but didn't have the knowledge to fill in the gaps in my argument.

So again, slownlo, changing the components in the crossover only changes the frequency of the XO point. This point is readily measurable by feeding test signals through the XO circuit (not individual components).

To state it again, I trust that Axiom engineers have tested and measured their crossovers so that they conform to a level of quality control that allows their speakers to consistently achieve the expected performance.

Your entire argument hinges on the assumption that more precise parts result in a better sound -- when in fact all you're going to get is a different sound due to the fact that the crossover point has changed. Wouldn't you agree that the crossover point that comes with the speaker has been carefully chosen and consistent beyond a detectable level between one speaker and the next?