Good drivers usually do tend to require break in. It literally took months for my Dyn's to break in, I probably drove the dealer crazy calling and asking, "are you sure these are alright, going to break in?". I heard them before buying but they sure didn't sound like that out of the box and took forever.

Thanks for the input, No Cacophony, what do you drive your Zu with? Do you find the sound quality on par with other speakers in the Zu price? Getting up around $3k there is some good competition.

Any of you heard Harbeth and can compare to Zu? I'm sure the Zu would be more lively.