I don't know the answers to any of the questions
I want to know myself.
But I read into the installation manual for the Dension iCon drive it and it mentions connecting it to fibre optic MOST system. Didn't know that the car had it unless it had the Premium / Individual Hifi option, or does the car run in fibre optic regardless.
Really confused on the installation of it all. Been looking for ages and couldn't find much information on it at all.