@Aspen03 That was very useful information. I searched it on Youtube and watched a guy tie into his two back speakers. It didn't look overly complex and much simpler than accessing the head unit. I miss not having any bass in my XLT.
Welcome. I used to be a 12v installer, had to get out due to back injury from an accident. Wasnt worth the $ to be in pain most days. That and a new "supervisor " I didn't agree with was the final straw.
The LC2i is an amazing piece of hardware. Audio Control makes a 300w amp that is TINY and basically has an LC2i built in. They make great stuff, lots of control and incredible sound quality. The amp also has a provision for remote level control too, a factory head unit won't do that.
It's the ACM 1.300 300W RMS into 2ohms and 175W @ 4. Throw anything in the 8-10" range of a Kicker Comp R, Alpine Type S or R. The JL Audio 8" W3 pairs up quite well to it and will really surprise a lot of people the volume you'll get out of it. 2 of them in an F150 sounds like you have a big 12 pounding under the seat. They won't dip quite as low, about 28hz but still impressive.
They also make it in a 2 and 4 channel version. The 4 channel is slated to go in our Navigator next month when I have some time. I'm waiting in Infinity to get some Kappas back in stock that I can order through work.
The truck in the link w the 6x8 type R's likely sounds amazing, worlds better than anything ford or Lincoln has done.