Where’s the 7th speaker?

Moin Moin! I’ve been the proud owner of an OmiB Facelisft Bj. 2000 with the Bose system for 3 weeks. Everywhere I read that this sound system has 7 speakers. 6 I’ve already had a flurry, but where is the 7th one hidden? Besides, the CCRT2008 should have an AUX input. Is it already led somewhere outside, or do I have to put a cable in the glove compartment (for my MP3 player)? Greeting from the north Pubbel