speaker set up?

[ICACHA]

Hi there i have a 95 EG sedan, i currently have two 6"splits in the front doors and 6x9's in the rear doors, i have made a fibreglass parcel shelf with spots for 4 6" speakers.

I am not too sure how to set up the back 4?
Should i use 4 Mid range ?
Should i use 2 mid range and 2 6" splits?
Should i ust 4 6" splits?

I really want a bit of bass up there, should i just leave out the splits and go for 4 mid range?

any help on this small thing would be appreciated

you sound like a car manufacturer... 14 speaker system

we listen in stereo, stereo means left and right and we tend to add a sub for lows as smaller speakers cant play low very well. the more speakers you put in the more people see how many times you have stuffed up trying to get it right, hense the car manufacturer comment