I just purchased a 2006 911 Cabriolet. I love the car! Has many options and one them being the Bose High End System. Can someone help me out in determining how I can confirm that indeed is it is the high end system? Where are the speakers located? I only count 9 speakers (3 on dash, 2 on each door and 2 in the side panels in the back seats). Am I missing something? Thanks.