I guess my question would be, what’s breaking in? I’ve heard that capacitors need break-in time, so the crossover might need some time. The drivers themselves are moving parts and it seems very likely that they might undergo a certain degree of mechanical change during the first hours of use, not unlike a new pair of shoes break-in. This probably is the primary effect actually, and seems very likely to be real.

I can only guess at how long it takes. Going back to the shoe break-in analogy, probably a month of regular listening will get you through the majority of breaking in. I personally don’t have good enough ears to hear it.