Radio Wiring Question

[Tweetdriver63]

I have done a lot of searching and looked at a lot of threads. I've looked at a bunch of wiring diagrams all over the interwebs until my brain hurts.

I'm currently installing the AliExpress Android head unit designed for the 996?986. It looks fantastic in the car--very much like the PCCM units. I'm just having a little challenge because it really didn't come with any instructions, just a bit of a wiring diagram that's hard to interpret, and several harnesses without explanations.

Anyway, the question: Did Porsche power the front dash speakers through the amp front inputs and the door speakers through the amp rear inputs? That's kind of how it appears. There are only two low-level RCA outputs from this head unit (left and right, obviously), where the aftermarket unit I just took out had four. When I added rear speakers a few years ago, I just connected them to the head unit's high-level rear outputs, and left the four low-level connections as they were. All the speakers worked fine, as did all the balance/fader controls. The thing about this one though, is that there are only the two low-level RCA outs on the head unit. This head unit's harness appears to connect those two RCAs to the front speaker connection in the car's harness, and then it bridges the rears with the fronts. I assume that will make the dash and door speakers function properly, but I'm not sure how that will affect the fader control. I'm planning to connect my rear speakers using the rear high-level outputs on the head unit, just like I did before. I realize there really isn't any other options, short of completely rewiring all of the speakers to use the head unit's high-level outputs.