This may have been covered before but I am confused with the speaker configuration in my z4. It has the basic 6 speaker set up,wich comprises of a midrange,woofer and tweeter. Isnt this just 3 components of a stereo speaker system,I mean all I have is 2 speakers (left and right) with it split into 3 separate components to make 6. I can see the sense of a L-R balance control but not a Front- Rear fader because in essence I only have 2 speakers. See told you I was confused.