I have been running my IDCTX65CS mids in the door in custom built pods (not opened up into the door yet, but they are installed and attached to the car) and have been experimenting with several tweeter placements and it's starting to piss me off...
I tried the kicks, but the kicks are too deep under the dash to get good imaging. I tried the factory location above the mids, crossfired, and it sounded decent but the soundstage was way to low. I tried upper door, not good imaging. I tried A-Pillars crossfiring, and I have to set the fader three notches to the passenger side to avoid getting blasted by the tweets (but then the passenger suffers). I tried far back on the dash, crossfiring back into the car... good sound distribution, not good imaging.
I'm at a loss... I'll probably just mount them down next to the mids and leave it at that.