that's a hard comparision to make, simply b/c re doesn't really make anything that's extremely comparable in spl and sq to a w6v2, as far as sq goes, the w6v2 in amazing, the xxx is about the only thing from RE imo that will keep up w/ it sq wise, spl wise, anything SE series and up will be able to get as loud as the w6, they just won't have the sq
it's a hard comparision, b/c RE makes their subs w/ different intentions than most jl subs, the w6v2 for example was made to sound as good as possible, now, you have to take into consideration that's exactly why the xxx was made, but, the xxx can get loud too, the w6 can get loud, just nothing close to what a xxx can, so all in all, a xxx will do more than the jl, but nothing from RE really matches what the w6 can do and only that(not being able to do more)