audio set-up for beginners [continued]

[sientobente]

Are underseat subs good enough? My sealed sub is so large that it takes up a seat at the third row. I'm looking at the NBN-V12 generics at around 3-4k or so

There are actually subs that can use up a smaller enclosure. One affordable brand is Hertz. Forgot the model, 10" siya, and it can run optimally using an enclosure that is as big as a 2-liter(?) box or kinda like 2 boxes of champagne/wine. Very capable and sounds impressive for a small enclosure.