I believe the SX is made mostly for spl, I'm sure its got good sq (being its made by RE) but if you have the money for 2 w6v2 you might as well get an xxx which has better sql than the sx.
I had my 2 JL 12w6v2's sealed last time in the JL prowedge box but now im also gonna test them with a new amp which is the crossfire vr1000D and go mono at 1 ohm. I also was thinking of porting the 2 12w6v2's.. What do you guys know about these subs ported. The 12w6v2 had the best sq ive ever heard sealed but on some songs it whould lack some more output. That is why i am considering having a ported box built for 2 of these quality subs.
Also havent really heard my Avalanche 15 yet in the 2.5 sealed box yet so i hear that has good low end bass and has good sq.