i have the diamond hex s600s in the front, stock locations for the mids and tweets...
it is bizzare i actually decent imaging, but only in the driver or pass seat. I put my head in the middle where the distance would be the most equal, both for tweets and mids and the imaging goes to crap.
I know there are level and phase switches on the xovers for the tweets, but i don't know what the installer put them at (this was a rare instance of having someone else install my stuff)
oh yeah...don't do anything in the rear for the front passengers. unless you are doing actual multichannel you will hose the imaging. you end up with phase issues due to the multiple distances for the same audio info...