Putting a new (old) head unit in my z4 with the basic speaker set up,have put some 6.5" speakers in the rear cubbys and was thinking of putting new bigger ones in there. In such a small car I was thinking of not connecting the front speakers and connecting the front and rear outputs from the radio ( 4x45w) to just the rear speakers creating a basic stereo non fading set up. Would this work OK?