This is quite late, and you've probably resolved this by now, however:
I have a '96 W210 which is probably completely different, however it sounds exactly as you describe, and is billed as an "8 speaker" system by MB.
There are eight elements in six locations. The lower speakers on the front doors are two-way speakers (4 elements). The rear doors each contain a one-way speaker, and there are two more one-way speakers in the rear deck.
The speakers in the dashboard are not used by the Bose audio system. I'm not sure that they're used by the standard system either, but rather the telephone option. I think they're also used for alerts which are also displayed on the multifunction indicator panel (aka odometer).
The two locations that appear perfect for tweeters are used for the standard system only. No speakers are installed there with the Bose system, although the wires are present inside the door.
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