The Polk Audio Monitor XT20 Black Bookshelf Loudspeakers are a high-quality stereo speaker with a sleek black design. These wired loudspeakers have a 2.0 channel system configuration and a Dolby Atmos surround sound format, delivering immersive sound quality. With an impedance of 8 Ohms, these bookshelf speakers from Polk Audio are perfect for creating an audio experience in your home audio setup. The Polk Audio Monitor XT20 Black Bookshelf Loudspeakers are a reliable choice for those looking for excellent sound performance and a stylish addition to their sound system.