Upgrade your home entertainment with the Sonos Arc Ultra sound bar and Sonos Sub 4 wireless subwoofer bundle, designed to bring immersive, cinema-quality audio into any room. With the Arc Ultra's drivers and Dolby Atmos, you'll experience 9.1.4 spatial audio that surrounds you from every angle, while the dual force-cancelling woofer deliver deep, powerful bass. | Sonos Arc Ultra Sound Bar with Sub 4 Wireless Subwoofer - Black