I BAUGHT THIS FI 18" SUB, AT THE TIME OF PURCHASE ALL I KNEW WAS BTL AND BL AND I FIGURED I BAUGHT THE BL BUT AFTER LOOKIN THRU TOPICS OF GETTING IDEAS FOR MY BOX I WAS GUNA BUILD, I RAN INTO THE OTHER SUBS SSD Q BTL BL AND ETC, CAN ANY ONE GIVE ME ANY INFO ON HOW TO FIND OUT WUT SUB I HAVE PLEASE AND THANK U.