the SX will get louder than the XXX if both at given the same amount of power. ex: if both are given 1200wrms, the SX will be louder.
the XXX is a loud sub, but it isnt as efficient as the SX. the SX has good SQ, but the XXX's SQ is amazing.
so if i just wanted 2 12's that will get louder than sounding good go with the sx's or the xxx's. will i be able to notice the difference in sq if i had 2 12"s. i just want to have a loud system that has good sq, everyone at my school has L7's and audiobahns and i know re subs are louder and clearer so which subs should i go with that will be louder than most peoples and have better sq while on 1000 budget for subs and amps