Analog vs Digital DSP (Grom Install)

[mr_robot]

My 2005 4.8is has MK4 Nav w/ CD Changer and DSP.

I'm trying to see which GROM I want to install and removed the CD changer to check some stuff out but I came to realize that my DSP (although it's working via the nav menu and can change the EQ) did not have the coaxial cable's connected nor is it present?

I can see my amp has the coaxial input but nothing is connected to it and the CD changer has not coaxial at all.

The MK4 DVD has coaxial as well but nothing is connected to it either.

According to Grom's PDF, MY2002+ should have digital DSP with the coaxial connected? Am I not understanding this correctly?

https://gromaudio.com/docs/bmw-dsp_application.pdf