4 speakers vs 8 speakers

[pennyracer]

hi from what i understand rear fill music is only 2% of your sound no need to pump to much highes in the back the front stage is ware you want to spend the most time and money on i went from arc 6 1/2 " 2 ways up front and 5 1/4 " in the rears changed the fron to focal 3 ways wow what a big big gain still not sure if im going to go focal 2 way or maybe 8" focal 2 way for a litle more mid bass i use a arc audio 300x4 highes amp and little more for the 2 arc 10" subs getting ready to buld a fiberglass sub floor that hols 3 or 4 10" for a bit more kick :) it gets off real well already bit i want lots more i would like to hear some good input about using 3 or 4 diamond 10" subs powerd by my arc audio 1000x1 sub amp i have installed now and works very well it will run a 1 ohm load i have herd good things about diamond but is it better than the arc 10" subs i run now