The only perfect place for stereo imaging is in your living room of your house with the speakers right in front of you. There is NO perfect speaker placement in a car. There are good placements and bad placements but NO perfect. Imaging is ALWAYS going to be a problem in a vehicle. All you can do is find what's best for YOUR particular car or truck. Time alignment is the only weapon against this.The one problem I've always seen associated with door mount speakers is having to do with imaging. Yes, path length differences can be corrected using time alignment, but that still doesn't fix the imaging problem. I'm not quite sure anything can fix an imaging problem if the problem is due to the mounting location of the speakers.
Imaging referes to the placement of each instrument as you'd see them on stage. In a perfect musical set-up, you'd be able to close your eyes and point to exactly where the sound of each instrument is coming from. It's very difficult to achieve such a set-up in a vehicle.What exactly are you guys refering to when you say 'Imaging?'
or you can just vent the kicks, but not everyone like cutting up their cars..I can think of plenty. Not always possible to get the right sized speaker or the right airspace in the kick. The pathlength difference might be less with the speakers in the kicks, path differences can be addressed with time alignment. To little airspace or too small a driver means no midbass response. No amount of processing is going to fix that. Could also lead to coloration of the sound and effed up tonality. Again almost impossible to fix with processing.