So let me figure this out you say you have a 22 x 26 room but you have no space for a couple of inches here or there for slightly larger cabinet subwoofer why do I see a problem with that.
My guess is she just doesn’t wanna see them in general.
Imo, duals are the way to go, and that room easily calls for duals. For my money ported wins the day, waf need not apply, and two pb4k’s is cheaper than two SB16 ultras, and will easily outperform them. The sb16’s would have a little more midbass but below 35hz, the PB4’s easily win. Another option I really like is the PC4000. Great form factor, with the same performance as a box.
At the end of the day, waf is waf and everyone has to weigh that differently so...
If it HAS to be sealed, then I guess the ultra is the one to choose. My thinking was a smallish room, but 22x26 is good sized, and how many other rooms are attached...?