No according to BMWUSA.com the base sound is 10 Speakers, 2 Subs and a 7 channel amp with 205 watts. Premium Sound package is still the same--- has 13 speakers, 9 channel amp with 600 watts.

__________________
2008 X5 4.8
Jet Black/Black Nevada/Dark Burl Walnut
Adaptive Drive
Premium Pack
Tech Pack
Climate Pack
Sport Pack
20" Wheel Option
Premium Sound
Sirius Satellite
Rear DVD Entertainment
Multi-Contour Seats
Comfort Access
3rd Row Seat
Heated Front Seats
Running Boards
3M VentureShield Paint Protection Film