I have a few reasons for choosing a sealed enclosure.
vs
A sealed enclosure at 6 cubic feet has a better frequency response curve than that of a vented enclosure. Also, since I'm running a vented enclosure currently, I'm losing a lot of sound under 40 hz(12db/octave) + the 12 db/octave I'm losing from the amp's subsonic filter.
I want a sealed box, not a bunch of people telling me to go ported.
out of all of those box specs your best bet is the 6 cu ft ported deep bass box.i owned L7s 15's when they first came out and tried everyone of those boxes plus 2 other ones, best sounding was the 6 cubes box. id even take the single 15 in that box over 2 of them sealed just my 2 cents...