I really do wish that there WASN'T break in for speakers. No doubt, some more than others, have a distinct amount of change. Yes, I do try to 'adjust' my hearing or impression at first, just so I can listen to some music, but if a driver has a midrange sibilance to it for example, it will be impossible for me to listen at all. One set of Audio Nirvana speakers sounded so bad for the first 4 hours, maybe more, that I wanted to send them back. By the end of the first day(in my shop, playing louder and louder) there was a very noticable change. Some things are not so easy to believe until you have heard them happen more than once.