Their website claims they should be ready out of the box and that they put 600 hours on them at the factory.
If the speaker uses paper drivers and foam surrounds break could be related to the speakers. If the speaker uses rubber surrounds (a material that doesn't change over time - uses kevlar or plastic (polyproplene) wooofers (materials that never change over time, and the tweeters are made form ANY metal variant (that never change over time) then there is likely to be no speaker break in - there is audiophile break in as in your ears get used to the speakers.
I think you should get a sense of the speakers fairly quickly - 20 hours. Play Music like the following at fairly high levels continuously and if it still has issues after 20 hours return them.
http://www.youtube.com/watch?v=WK5Z2FkEuGg
Edit: I posted that piece of music and then I saw my speakers playing the same cut with my amp as well a big 4 watts! - spooky -
http://www.youtube.com/watch?v=QShLEfQeJF4