Well, all DSP happens in the digital domain.

The BMW DSP amps take in analog signals from the tuner module and the tape deck and convert them to digital so they can be processed.

In addition, the earlier X5s had a coaxial digital cable from the CD changer to the DSP amp.

Later, some X5s are missing the cable. BMW decided that there wasn't any loss by sending analog out of the changer and sending it through the same A/D conversion as the tuner and the tape and the AUX signal.

And with their DSP system's sound quality, they were probably right.

So the way to tell is to see if you have the Digital Coax cable out of the changer or not.

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