The Airmotiv SE12 sub includes a downward-firing heavy duty high excursion powered bass driver, a front-mounted performance-matched high excursion passive radiator, and a powerful audiophile quality amplifier. The cabinets on our Airmotiv Flex subwoofers are crafted of heavily braced acoustically inert MDF, with integral shock-absorbing feet, and a durable yet attractive textured vinyl coating.