Trying to understand how the speaker wiring is tied in when using the Nav-TV. Correct me if I'm wrong.
Use speaker harnesses on front/ rear doors to connect to factory wiring. (Metra 72-5602)
Am I tapping into factory speaker wiring at the b&o amp connector using Nav-TV instructions listing wire colors. (Right front +/- Left front +/- Right rear +/- Left rear +/-) then connect to aftermarket amp speaker output?
Then mount crossover near amp and run wire to the new tweeter at pillar.
The Nav TV never plugs back into the speaker wire harnes. They give you the colors to help you.
You tie your new aftermarket amp into those wires.
Nav TV > AMP > speakers
you can use the factory wires for both doors. Most of us, put a coax in the rear door, and components up front. So using the factory wires for the coax in the rear, and the woofers in the front, you will have to run new wires for the tweeters in the A-Pillars. There are no wires at the back B&O amp location for the tweeters.
The stock tweeters get power from up front by the head unit. When you remove the stock tweeters, just leave their wires disconnected.
Also, most of us do not run a center channel. It is not needed when you have properly imaged aftermarket amp and speakers.
Hope that helps. Let me know if you need anything else.