They don't. That would put the retail price more like $9500 and they wouldn't be priced where they are. While the premium parts must make some difference, it's difficult to imagine a speaker much more refined. I have read the main effect of the poly xover is to make it an easier load, but, they are also already an extremely easy load, it seems, having no volume limits in a huge room with a 25W First Watt F4.