Thanks for responding ppro,but your write up doesn't really answer my question. If I'm not mistaken, you are either using only front outputs (1 right, 1 left) from your HU or you have replaced your amp. I am wanting to use front and sub line-outs from my new HU connected to the OEM amp, allowing me to control the rear OEM subs independantly of the door speakers. Because, according to the schematic, the Rt/Lt out is split to allow separate Front and Rear inputs at the OEM amp, I just need to know what the 8 connectors, shown boxed on the attached diagram, lead to. (Right Door Speakers+, Rt. Sub -, etc.) Thanks again.