Beolab 6000 woofers unfortunately have a specific design specially made for this speaker box, speaker frame glued and molded into a custom holder. Replacing it with a normal speaker that requires you to adjust the mounting plate seems almost impossible to me. Also I don't think they are available with a suitable size en power range and impedance, the reason that B&O had them specially produced. If you so quite handy as you say, just provide them with new rubber edges, total material cost maybe € 30,- Otherwise it will simply be € 350,- for 4 brand-new speakers or used ones on Ebay refurbished by someone else for less than half  that amount.        

Thanks Leon, I am going to hold off on changing anything for now, because I discovered something else that changes everything: when I use the 6000s with my beocenter 9500, they seem to suffer, they vibrate too much, the result is poor, which is why I was thing of refurbishing or changing the drivers... BUT: when I use them with my phone through a bluethooth adapter, they work beautifully, become powerful again and produce beautiful sound. My 9500 has a powerlink output probelm I think, because through the analog outputs it produces very nice sound throuh my beovox RL-60s...Somehow I wish I could use the 6000s as passive not active ;-) Does anyone agree with my assessent, and/or has encountered similar issues ? Thanks, Amine.