allright so i have one 15" L7 solobaric, im looking for serious bass, what kind of box should i put it in? a friend had some 12's i dont remember the brand in two sealed boxes and they hit ok, then her got this one box with like a plexy glass cover over the subs and it was ported and damn then they came alive!! so im wondering if i should get another L7 and find a box like this? any ideas please. when ppl talk about tuning there subs what does that mean?