I just got my 2005 C230k Sedan with 320 Entertainment Package 12 speakes system 1 center speaker on dashboard, 2 tweeters on side rear view mirros, 1 on each of 4 doors, 2 on top of back seat. Total of nine speakers. Somebody knows where the 3 missing speakers located on the car

 

two on front doors each (bass and mid-range...except for the triangle on the mirror).

one on the center of the dashboard. you may only see it as a ventillation cover.

 

Thanks sleepwalker for the help. The local Mercedes dealer here in San Juan, Puerto Rico they don't know. They only know how to sale cars.