Tapping line-level output from 2013 Shaker HU
I've got my JL 10" all set, with JL 500/1 installed, connected, grounded, remoted, and only have two things left. Connecting the pos of battery AND finding the line-level output from the head unit of the shaker. This is not the shaker pro. 2013 GT Premium without Nav. I see amp at driver's kick panel and a large wiring adaptor containing all the wires from the HU.
Nowhere on the Internet can I find where to identify the low frequency input to the stock amp. Since I've run the line up to the front and want to avoid a double-amp signal path, I really want to tap into the HU sub output... can anyone point me to the diagram or help identify the inputs for the front subs?