Bruce, I don't know about the Paradigms but I can tell you most of the Axioms I've received sound different (better) after 5 to 30 hours. They also sound different if you haven't played them for a while. Ambient temperature and humidity matters with regard to how they sound.

I don't know what's responsible for the differences but one thing I do know is the tweeter uses ferrofluid for cooling. The viscosity of this fluid is a function of temperature.