I want to have mostly a  sq based system,  but i still want to be able to feel some bass.  I want to run 8's just to conserve some space.  How well do these hit low frequencies.  I mostly listen to mostly rock and R&B so i kind of need some all around performers. I can imagine they will get pretty loud in a truck,  but does anyone run these in a car?  If so throw me some info.  I'm still not sure if i want to run 2 or 3 though.   The Vehicle in question is a 2004 POntiac Grand Prix.