@jayctoy - seems to me you're a good sport, good to interact with you.
In other threads, I have mentioned the possible pitfalls of swapping out drivers into a speaker and how it may (more often than not) disrupt the linearity of the output.
Often a good design will use crossover frequencies that take into account the frequency response of the drivers themself, using strengths to hide weaknesses and breakout in response. It is truly an art to match speakers (drivers), as all are compromised in some way or nother, and to engineer the very best out of them.
In fact, it's often not the best stand alone qualities of the drivers, but the unique pairing that happen to resolve well, where blending the responses with such finesse where they actually sound as though there is no seam between them in the soundfield - that's real talent.
By swapping out a driver, perhaps an even better quality driver (sound quality, not build) it can upset the frequency response and the cohesive response of the voicing of the speaker. It's dependent on the design of course, a lesser design is less prone to losing quality sound, and well, heck there's nothing to say you can't just get lucky!