There are Infinity separates too. When I did mine I did everything at once including a 5 channel amp. I used the amp feed to the 6.5s for my new speaker leads. I bought a set of wire adapters and jumped from the 6.5s to the crossovers then to the wiring for the now gone 3.5s. That allowed me to get to the tweeters with factory wiring. You cannot do this with the factory amp though. I abandoned the mid/tweet wiring at the factory amp plug.
Not that it matters now but those are not the factory lower door speakers that came in my 2019 GT Premium with the 9 speaker system. Those junkers are what came on the rear deck panel. The factory lower door speakers are strictly a woofer so I don't know if putting a 2 way speaker in there will add much. The factory speakers are actually a descent quality speaker, I've changed the 3 -3.5" speakers in my car to Kenwood KFC-X3C speakers and the rear deck speakers to Rockford Fosgate P1650 speakers. It sounds nice and clear but still lacks bass.
The front and rear 6.5”s are the same in the 9 speaker system. The 12 speaker B&O have coax rear speakers but the same front speaker as all the other trims.
Not in my car. It may vary by year but my front lower door speakers have a roughly 3" magnet on the back were the rear deck speakers were maybe 1". Big difference in the quality between the two.
Pretty much everything about this car has been weird, to be kind.
Here's the lovely pair of OEM speakers I removed from the lower doors. Both are thoroughly trashed. One has significant rust on it so it either spent some time much too close to the Atlantic Ocean on Miami beach before coming to Wisconsin or there's an issue with the weather sealing on the door. The part number on the speakers is GR3T-18808-KA, which does show they are from a 2016 GT. Pitiful speakers!
That thought crossed my mind too but nahhh, there is no way that "Mint" Auto Sales of Orlando, Florida would sell a car that had undisclosed issues like that. These "mint" condition speakers are all just part of the "Mint" Auto Sales buying and ownership experience.
The problem with running your tweeters and mids in parallel (like OEM) is the ohm load. Assuming the aftermarket’s are 4 ohm you can leave the wiring stock but you’ll need to figure out how to band pass to the tweeters so you’re not feeding them frequencies that will damage them. Not to mention you’ll be driving them at 2 ohms which will overpower your woofers unless they are on a separate amp or you can control the gain on just those channels.
You know, I really do like the rumble of the Mustang's exhaust. I should just hum to myself when I want music.
