Car Audio Subwoofers

i was checking out prestons awesome truck with 12 15" DC subs in it and i decided to attempt the LOW LOW note on "Put on" (by young jeezy) and see if i could play it better then before. The new SMD's DEFINITLY like this box better then the older BTL's! The new SMD has so much motor force it actually likes a smaller box. Each 18 is in about 4.25 cubes.