Ive searched a fair bit and so far have been unable to figure out the best way to do this? I have a NON-Mark Levinson radio, with factory navigation. What I am wanting to do: I need a clean, full-range signal that I can run in to my aftermarket DSP and amps. I will be adding a sub, and replacing speakers, etc., in the vehicle. I have no plans to replace the factory head unit, but do want to still have use of the USB, CD player, bluetooth, etc., already in place on the factory head unit.

 

I installed my AudioControl DQ-61 cut out from OEM amplifier. It helps me to retain ALL my functions, including BT Audio.

However, for some reason, my rear channels sound like AM Radio (like the old days), compared to my front channels.

Here's the PDF to our audio system anyways:

https://drive.google.com/open?id=1Jd...1ufEHeZGf0pPl4

GL! LMK how yours turns out!