Why is the Z-E3215 MkII not compatible with vehicles, that are fitted with a DSP OE active sound system (BMW Logic7 or Individual)? B Why is the Z-E3215 MkII not compatible with vehicles, that are fitted with a DSP OE active sound system (BMW Logic7 or Individual)? Answer: Such sound systems receive audio signal via fiber optical cable (MOST ring bus). Since the aftermarket offers no compatible adapters, the Z-E3215 MkII is not suitable for deployment in such vehicles.