Where to mount tweeters on a rear door?

I vote B

Id say a , if it were at the b position someones ear is gonna fall off , thatll be loud af

I vote D, closer to midrange the better

A looks good.

A so that you only have to make a small change.

It's what I did in my Titan and i'm pretty happy with it.

don't put tweeters in the rear.... get a better pair for the front. have seen them put into the headrest of the seat infront too.

I'd rip all the rear speakers out and build a proper front stage.

But the A position is best because it will bring the imaging up from the floor some and that location is more on axis with the listeners. Most auto manufacturers spend a lot of time and money on the staging of their audio systems because that allows them to spend a lot less on the components they use. I would (and often do) take advantage of that research and keep things where they are.

I vote A