Posted October 8, 200915 yr I am trying to help my cousin with his setup, but i'm not sure what would be better for him.he has a chevy colorado ext cab. he's set on buying an fi sub, but hes torn between 1 btl and 2 bl's.He is mainly going for dialy spl.details:colorado ext cab.sundown 3000d.kinetik 3800220A iraggi alt.big three.now my question is, what would be best for spl? 2 12 inch bl's or 1 15" btl.the bl's will have more cone area, but the btl's are built to be louder.(considering the boxes are built to fi's optimal recommendations)all comments are welcomed, thanks.