Nice to hear an opposing opinion, Acurus! The reason I asked about break-in is that it has been my experience that these mid-range drivers with the rubber surrounds that are so common these days take a very long time to break in compared to the foam surrounds of old. (Yeah, I've been away for awhile!)
I have a pair of Snell K7's in my second system (very nice little speakers but not ProAcs by any stretch of the imagination)which are similar in size to a 1SC with a driver which looks much like the MR driver in the D1. They took seemingly forever to break in and the transformation was anything but subtle. They are, by nature, a little on the bright side, but almost intolerable before they were broken in.
I have a pair of Snell K7's in my second system (very nice little speakers but not ProAcs by any stretch of the imagination)which are similar in size to a 1SC with a driver which looks much like the MR driver in the D1. They took seemingly forever to break in and the transformation was anything but subtle. They are, by nature, a little on the bright side, but almost intolerable before they were broken in.