For the 12 inch older one, one of them is 2.5 cu ft @ 30hz, and the other one is 2.5 cu ft @ 35 hz. The lower tuned one says "SQ" and the 35 hz one says "SQL". I have no idea which one to get, because im not sure how each one will actually sound, the numbers mean nothing to me because i don't know about enclosures
