Pair Sub 4 with your Sonos soundbar or speaker for a difference you can hear and feel. Key Features: - Dual Sonos-engineered drivers generate deep; dynamic low end. The ported enclosure enhances the bass response and low-frequency output so you feel every beat; roar; and rumble in your chest - Pair Sub 4 with Sonos Arc Ultra; Arc; or Beam for dramatically richer bass; clearer highs and deeper immersion in all your entertainment - Discern every subtle detail and enjoy a more spacious soundstage when you pair Sub 4 with Sonos Five; Era 300; or Era 100 - The acoustic architecture creates a force-cancelling effect that virtually eliminates distortion - Sub 4 takes over the lowest frequencies so your paired soundbar or speakers can deliver high and mid frequencies with even greater clarity and precision What's in the Box: - 1x Sub 4 Wireless Subwoofer - Matte White