I'm pretty sure. The problem is that the Mercedes headunit has no pre-outs. So the Bose amp uses its speaker outputs as input. Since the empeg has no speaker outputs I have no way to connect it to the Bose. The 4V outputs of the empeg cannot be used as input for the Bose. Only thing I can do is replace the Bose (which means tearing the car apart to run new wires) or add a 2nd amp between empeg and Bose amp, which is rather silly (and would require new wires too).
I have the unit lying on my dining table for about 2 weeks now, looking for a solution

Frank