These JBL GT-12BP 12" BandPass Subwoofer Boxes offer the clarity of a sealed sub enclosure along with the power of vented enclosures. The GT-12BP provides accurate bass response and booming power, as well as a sleek finish. The sub box features a look-in style acrylic window, slot vented design and an injection-molded polypropylene woofer cone for superior rigidity.