The Logitech Z-5500 THX 5.1 Digital Subwoofer is a high-quality audio accessory designed to enhance your computer's sound experience. With its wired connectivity and THX surround sound format, this black subwoofer from Logitech is perfect for creating a powerful 5.1 channel sound system. Tested and confirmed to be in working condition, this model is ideal for those looking to upgrade their audio setup with a trusted brand like Logitech. This unit has not been tested as part of the entire system. Sold as is.