When you have great imaging up front and the soundstage is high etc it is really hard to tell that the front speakers are really in front of you, it sounds as if you have headphones on and if the bass is right it sounds like it is not in the back.
My current setup is not like this but I am counting on my next venture.
If you have average imaging which is very possible even with great comps/amp/doors deadened then the rear speakers can actually give the car that full sound, basically the rear speakers pick up slack for the poorly aligned fronts and this is why so many people say they like the way it sounds because it does sound better that way in some cars. But if you can get the fronts really sounding good then the rear fill just screws all that hard work up......but that is why we have a fader so you can have it both ways if you want.
I'm Carol!