The Qpower Single 15' Side Ported SPL Xtra Large Heavy Duty Empty Square Woofer Box is a one-of-a-kind product that is perfect for any car audio enthusiast. This box is specifically designed to house a single 15' woofer, providing maximum bass and sound quality. The side ported design allows for optimal air flow, resulting in a deep and powerful bass response. Made with heavy duty materials, this box is built to last and can withstand the demands of high volume and intense bass. Its unique square shape sets it apart from traditional rectangular boxes, making it a standout piece in any car audio setup. Upgrade your sound system with the Qpower Single 15' Side Ported SPL Xtra Large Heavy Duty Empty Square Woofer Box.