i'll say this. Bandpass is loud but, i really don't like it. It misses a lot of notes and it becomes a 1 note box. Plus is very hard to do a good working bandpass.
I'd go with a normal box and depending your taste, you choose between sealed or ported.
What subs r you going to use. Would be nice to know to give you a box recommendation
iv heard good things about bandpass on caraudio.com a guy on there 80inches builds some really nice ones and everyone seems to love his sooo...get plans from him if your going to go bandpass personally just aero port it
there are different types of bandpass encloaures, pre fab is garbage, sounds sloppy and muddy. $th order bandpass is nice so is 6th order if you know how to build them. They take a lot of exact calculations with no room for error. My buddy had 2 soundstream reference 12's in a 4th order bandpass and holy SH!T was it loud
