MANY THANKS TO SOUNDLINK TEAM SUPPLYING US ONLY THE BEST OF THE BEST. Every knows that this drivers are difficult to find. perfect sound quality. mids and highs are so smooth i don't believe can any company can do better than this , now and in the future. white dampers work perfect for me. My driver combination is 2 dual 38D1XJ00 , 1 dual 2389D , 1 dual EST65QB02 each ear.