Call B&W North America. Their website or your owners manual will have number. I'm sure their tech dept can answer your question, and/or they can steer you to nearest repair facility (usually the nearest dealer).
B&W 705 question
Please forgive my inability to find my answer with the search function. Is it possible to repair cosmetic damage to my B&W 705 tweeters caused by little fingers (grandson) poking in the foil (dust?) covers? I am willing to replace the foil if that is what it takes, but where would I be able to find this service. I remember reading about the various ways to pull the dents out, but does any tech provide this service? I live on the west coast. Thanks for your help.