Originally Posted by
Hic
1) can you imagine the stage as the band is singing a song ?
In your mind do you associate where each sound is coming from ? i.e. [ piano/left and rear , drummer/center and rear , guitarist/right of lead singer/who might appear to be standing front center ] et cetera.
the teaching here is based on a high and deep soundstage [ above dash and the further away or out onto the hood of vehicle , the better ].
By using your amplified co-axial speakers in front doors may give you a better outcome ^ ^ ^ ,[ than using all the additional speakers , 6x9's in rear doors , the smaller speakers in dash. ]
subs/components that are on 4-channel would be a starting point and as you read up on other things here or you tube ... wherever , then you can open another can-of-worms !
You seem to have a good grasp of what "you" like !