Conventional drivers have components made of materials that move, bend, and flex. I can't see how anyone would not think that those materials would have a break-in period. How long that period is, and how big an impact that makes in the grand scheme of things, is much more problematic. But I tend to agree with the poster who said that if you don't like it when hearing it new, the chances are you won't love it once it's broken in.
Speaker Break In...? Or listener “Break In”?
Im interested in opinions regarding which has more impact; a speaker changing sound over the first 100-200 hours or a listener becoming more in tune with a certain speakers qualities and characteristics.