As far as I have seen no Z4 has a Digital dsp.
The amps have a digital input, but it is not activated (and no lead goes to that input).
I think the digital dsp's are pre z4, so probably 3 and 5 series (maybe an early 2003 z4).
But I have a 04 z4, so maybe a z4m owner can give the exact answer.
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