band pass would produce more bass than sealed if tuned properly...
but DONT put it bandpass:nono: ...save your ears from the trauma //content.invisioncic.com/y282845/emoticons/crazy.gif.c13912c32de98515d3142759a824dae7.gif....
if you want more bass from your sub, put it ported, it will still lose SQ, but give you more spl. and it's lots better than bandpass. but make sure you tune it to the correct Hz your sub calls for, or will not perform to its standards..