Here is what I'm planning to do.
Behind the head unit and using speaker level inputs, an Alpine 445U Amp.
It's 50W RMS x4 at 4 ohms.
I'll use the 12V accessory (cigarette lighter) lead for an on/off blue lead to the amp.
I've been told by some cool peeps on here that I need to solder 5w 47 ohm resistors between the + and - of each speaker level output from the head unit and before the amp input otherwise the head unit will not detect proper resistance on that channel and will not broadcast any signal. Grateful for this info, thanks!
In the front doors will go Kenwood KFC-6985PS. I used these in my 2015 and to be honest, I didn't really expect the clarity and the pounding power this Alpine amp and these 6x9s would deliver. I was literally blown away and is better than any Alpine or Harmon Kardon factory system available in these vehicles today, with the exception of the sub-woofer of course. That is for later and done professionally.
For the door tweeters, will be Kenwood ST-01. I believe these have built in crossovers and can be wired directly from the + and - of that door's Kenwood 6985PS.
And finally, for the rear doors, Kenwood 1695PS 6.5".
On my 2015, I used the Kenwood 1665S series in the back doors. While they offered crisp clear sound and good highs, there was absolutely no bottom end coming from these. I know they are 6.5" speakers and are primarily for mid and high ranges, but a tiny bit of bottom for just fill back there would have been nice. This time I'm going with the 1695PS which are reported to have better bass response due to radial cone design, like the front door 6x9s which punch you in the face with bass. So we shall see how they do.
That is it for now. All parts are on the way and looking like a June 1st install.
Deciding on whether or not to pursue sub-woofer addition. Depends on if this sounds anything like my 2015 similar install did. If so, there is no need.
If anyone knows where to obtain proper wiring diagram/schematic for the 2019 Uconnect 7.0 basic 6 speaker system please let me know. If I have to subscribe to a service or pay for it, that is totally fine as long as they have what is needed.
Be well all.
Keys
Addendum: I don't believe the 2014 JGC will need these resistors. I didn't need them in my 2015 with RA2 head unit and this exact setup.