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The system installed in my car is referred to as the Top Hifi configuration with Nav. From my research I discovered that the head unit sends a digital signal to the amplifier to control the volume. There is a analog signal from the head unit to the amplifier, but if I had used that I would not have any volume control. Since I wanted (had to really, because of the Nav) keep the head unit, I had to use the speaker level outputs from the stock amplifier. The Top Hifi system amplifier has four different drivers to cover the frequency spectrum.
You need to confirm which stereo configuration you have in your car and then determine where you can get a full frequency spectrum signal. Search the web for info on the different Z4 stereo configurations. I'll try and dig up some reference links I may have.
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