I had the same question about my DT-8's. Like itzhak suggests I emailed ProAc directly and got an answer the next day from Stuart Tyler with the information I needed. He is very good about answering emails as I recently sent him another about some changed published specs and again he got back to me the very next day. I love the support for the little things it gives me confidence that they would be there if anything major should happen. Love my DT-8's they hit way above their price range!