Shud i go 4 a second 10 incher and a more powerfull/expensive amp or a 2nd 10 incher a 15 incher and 2 or three cheaper splx(or simular) amps :go:

you get wot you pay for, i personally dont rate splx, and i wouldnt recomend putting a 15" sub in there, they are just too slow, (they cant keep up witht fast bass lines)

Look out for diamond subs, cm310 is the model number for the 10" subs or cm312 for the 12"

Again with amps you get wot you pay for, just get an amp that has enough power for your subs and spend as much as you can afford to on it

i had 2 10" subs mate and a 15" its hard to get a good balance if the amps arent set up.

i personally if i did it again would stick to 10" as they give better kicks and pay for the really good amps.