He didn't want to take them back. This was using classifieds, not Ebay or something, so i'm on my own. When i called him before, i asked explicitly if there are any problems or defects. None he said.
So i called him, asked him to take them back. His story changed. In the end he denied i even asked him anything. You could basically listen to the story change bit by bit, until he was the victim. In the end he said the speakers where in top condition and they are my problem now.
Needless to say, i was fuming at that point, what a lying piece of orange peel.
Once i cooled down, i called a friend, who is a lawyer. He said it's basically his against my word and he doesn't recommend to go the law route, says it's easiest to just move on. The money doesn't hurt me anyway, and i don't need the stress just to make a point. So that's what I'm doing, it's decided.
So then i called Kef. I asked what the driver units cost. 240€ a piece, 6 weeks delivery time. I'll order two tomorrow. If the Wireless II have the same replacement part number i might even get a classy grey instead of the rather ugly copper.
Once i have the new ones, i'll sell the ugly drivers. Maybe someone has totally broken ones or maybe someone wants to build a pair of Metas the very cheapest route.