I have a 2015 platinum with the Sony system. I would like to keep the head unit and factory sub and amp but add an aftermarket amp and sub as well. I have a low profile JL sub and an amp. I also have a line out converter but I dont know where or how to wire it to get signal and power. I cant seem to find a harness for this but if someone knows where to buy one please feel free to share. Or if not, where would I wire a line out converter?

 

My 2015 platinum Sony upgrade
Have since added a dd audio dsp and placed a morel 2.5 above the head unit

 

That looks like a super easy way to do it. Was hoping for something a little cheaper tho

 

https://www.f150forum.com/members/hushcaraudio-232419/
This guy can answer any questions and/or build you a harness

 

second vote for Bruce @ Hush Car Audio. He helped steer me in the right direction to upgrade my stock Sony system while keeping my factory head unit. If nothing else, get

PAC AmpPRO AP4-FD21

PAC APH-FD01 wiring interface