thanks for the commnets
1. they share one air space, in my opinion, when all the subs are the same and they are all powered off one channel of amplification, same box is perfectly acceptable. i have never seen an issue with it
2. there is a small dip at 60h-80hz, but nothing unusual, in this car, with the crossover set at 80hz, i didnt notice anyhting that seemed missing

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3. in this set up they are getting about 75 watts each, the dont need a lot of power, 100-150 per sub is all they need
4. the carpet i order is very specialized. Its a carpet that doesnt have backing, meaning two things it is very flexible to cover curvy areas, and its permiable so it can be used a grille covering material

i wouldnt touch anyhting autozone sells for this kind of thing

quite expensive at that, when i ralized it was the wrong carpet, it would have been too late to rder and ship out another order
5. the entire install, including labor, wiring, dampening, installation of avic speakres etc...from me is about 7-800

for a bigger sub done like this, cost would be about the same, perhaps a little more for the extra materials etc...but not a lot...but doing a full floor install like this with big deep normal subs sorta defeats the point for me in terms of stealth
b