Hi Beethoven Rocks,
I'm delighted with the results of your experiment. It backs up what I've stated at various times on these boards--that "break-in" is a psycho-acoustical phenomenon wherein your ears and brain adjust to the sound of new reproducers interacting with the acoustics of your particular room.
Hey, these are reciprocating electrical motors--air pumps--that are amazingly adept at simulating the sound of real musical instruments, so it takes awhile for us to adjust to the new illusion.
If break-in truly occured, the years of National Research Council data measuring various speakers' frequency responses run from new condition to operation years later would indicate that. But the curves don't change. Nor do the ratings in our blind listening tests of both superior and inferior speakers. If the tonal balance of speakers changed after hours or years of operation, then the subjective comments would reflect that, and so would the rankings of the speakers, as would the frequency plots. Sadly, bad speakers continue to sound lousy years later. Really good speakers sound great out of the box, and continue to do so for years.
Axiom Resident Expert