Hmm, ok. I do have a fairly large room, 26x25 and the bottom is open to the kitchen, which is 14.5 x 10 with 10 foot ceilings, so it's very large and very open. Not the ideal rectangular shape, but it's what I've got to work with at the moment. So you're saying that a large ported sub would be the best option, with these drivers? If so, that should hopefully move things a little bit more forward.
Probably several years down the road, I'm hoping to build an addition (a 3rd floor) dedicated to a theater room, but that is definitely a long ways down the road.
If one is going to make a simplistic assessment of the value of different alignments, it would be that sealed/IB goes the lowest, at the highest cost per dB; horns have the lowest cost per dB at the expense of size, and vented box characteristics lie in between the other two. None is inherently superior across the board, neither is any inherently inferior across the board. The one to use is the one that fits your response and output needs, available space and bank account. -BFM