btl's arent comp only!! there made for comps but can be used in daily pounding also... they are some what 1 noteish, i ran 1 15 ported 3.8cu ft tuned to 31hz and it got loud and sounded pretty good... they are POWER HUNGRY!! if your doing a 2sub setup, better have an xtra bat or 2 and atleast 3k to get'em move'n! LOL
could prolly be better off with one 15 fyi... or even go with BL series too...