Enclosed vs open

are you saying invert your subwoofer in a box so the back of it sticks out, or are you implying a box with no walls and just a frame structure? if its 1. then nothing changes if its 2. subwoofers require an enclosure, unless they are specifically a 'free-air' subwoofer, but i havent seen any to my knowledge. if its neither, please explain a bit more clearly. in any case, i would stick a 12" in a sealed enclosure because it suits my music taste better

I heard someone call it a bandpass, but im not sure thats what they were talking about. Its completely covered in a box, you can look inside the plexiglass to see it.

Bandpass boxes are often used by lower end companies, like audiobahn, dual, boss, etc. To make their subs seem more appealing. Bandpass boxes are made to hit hard at a certin Hz level (ex. 30Hz). This means the sound you get from the subs is loud, but not very accurate. So you can kiss sound quality goodbye. I (and most people on this site) would not recommend putting your subs in a bandpass box, if you want SPL, use a ported box, if you want SQ, use a sealed box.