Good staging and imaging are not so easy to implement though. It takes a lot experimenting with speaker location and direction. Directivity of sound is related to frequency. At higher frequencies it is easier to pinpoint where the sound is coming from, than lower frequencies. This can be used to our advantage in car stereo.
Tweeters are the most important part of getting good staging.
They should be aimed towards the middle of the car. Then cut your subs at a bit higher frequency. This will mix the bass coming from the front and rear, making the bass seem to come from the front. Adding a center channel also improves staging, if it is set up correctly. They are cheaper than separate woofer and tweeters and also easier to install.