Hello, I am doing some audio work on my 2000 s6 and need some wiring help.

Basicly I have installed a parrot smart head unit using the stock Bose system for now with a RCA adapter.
However I am looking to upgrade the front speakers with some focal speakers that I power directly from the head unit, then I want to still keep the rear door Bose speakers using the rear rca outputs on the parrot.
This is easy and no problem, however.

I want to separate the bose sub, this is using a separate amp I believe? And connect this to the sub RCA outputs on the parrot for more control. This should be possible? But what wires do I use, and do I need to run wires from the sub amp to the headunit or are they already located in the loom?

So in short today the rear doors and sub's are connected to one pair of rca plugs, I want to if possible seperate the sub to a second pair of RCA plugs, anyone know if this is possible?

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