Tertywerty

Hi, in the future, I am going to order a btl n2 12 and build the box up to reccomendations, and I just want to know what am I to expect from this subwoofer spl, sq and just over all loudness wise. This will be my first system, I just want to know should I be set with just 1 btl 12?

I am new to the car audio scene, and I would like to get the best bang for my buck, but I also want to "go big". I Have never seen an 18" subwoofer box before let alone an 18" subwoofer irl. I know they are pretty big, I want to know the standard ported box recommendations for an SSD 18, and if that box will fit in my 1990 jeep YJ with the back seats out. Help from you experienced set of guys would be very greatly appreciated!

I shall post some dimensions tomorrow when it's daylight c: