Typically it is the human brain that needs to break in, not the speakers. If a tweeter is made of aluminum, it does not change the more you play a speaker and if it does not change, neither does the high end sound. Perhaps if you took a hammer to it and changed its shape dramatically, then you certainly would have 'break' in.
But hey, who am i to argue against the crazy nuts that buy $1200 electrical units to run charge through things like cables to 'break' them in. One can never argue with a fanatic.
They are fanatic.
