Sonos Arc Ultra + Sub In-Ceiling Surround Package (8")Whats Included Sonos Arc Ultra soundbar Sonos Sub 4 wireless subwoofer Sonos Amp Pair of 8 in ceiling speakers (rear surrounds) True Surround Sound Without Visible Speakers At the front, the Arc Ultra delivers detailed, room filling sound with precise dialogue and immersive Dolby Atmos effects. The Sub 4 adds depth and weight, bringing impact to movies and music without overpowering the room. Behind you, the in ceiling speakerspowered by the Sonos