The PR Sub contains a heavy-duty 15" subwoofer in a vented enclosure. The portable yet sturdy high-quality plastic enclosure has a mount cup to affix the subwoofer on a stand, perfect for on-the-spot concerts, DJ sessions, or conferences. The blackened steel grille provides protects the hardware and provides a professional appearance. The PR Sub speaker system has a rating of 400 Watts and the woofer features a 2 3/8" diameter voice coil and a durable 50 oz. magnet.