Mike, I am kind of a cynic about break in of any speaker. They'll sound a bit stiff and sterile for the first five minutes, and after a half hour of spirited playing, they'll be 90% broken in. A cold room will make them sound unbroken in again, and temperature and humidity have much more effect upon the sound than hundreds of hours of break in. The only things that really become more compliant are the spiders and surrounds of the drivers, and you'll notice that mostly on the larger drivers. Excursion is so slight on tweeters that break in is miniscule. I have read Jung's papers on capacitors and dielectric retention, but only electrolytic caps have problems in this area. We don't use them.
I'm always amused at the corrolation between how exotic the speakers are and how long their break in period is. It seems the more esoteric the brand, the more hours are required. What is never pointed out is, if a speaker has a 300 hour break in period, when does it STOP breaking in? Right at 300 hours? When does it break in TOO much? At 500 hours?? If suspension components have that arbitrary compliance qualities, what is to stop the speaker from becoming too broken in and too compliant?? An argument can be made that the speaker requiring the least break in may be within tighter tolerances than a pair of Frobisher Audio Musical Nirvana Etheral Transducers, which require seven years of pulsating pink noise. (I'll stop; I'm spinning out of control.)
I suggest hooking them up and just playing them. Get your levels adjusted immediately, and check them in a month. They'll be the same. Your ears will adjust more than the speaker, but you will hear an improvement over the first half hour, even though it is not measurable. Also, listening with fresh ears makes a bigger difference. Don't use your Husqvarna chain saw on some saplings in the yard, and then come in and do critical listening.
I hope you love your new speakers, after all the prelude to you getting them.
aka TRIAD DUDE
I can tell people who are judgmental just by looking at them...