It may depend on the model and trim of the car. I can tell you that my 97 280 sport has Bose 8 speaker system + a woofer in the rear deck.
I'm sure somebody will correct me if I am wrong...
Locations on mine are:
2 tweeters under vent looking grills in the dash, one coaxial style speaker in each of the door panels, 2 in the rear deck and one woofer in the rear deck.