Sonos Arc Ultra Dual Sub In-Ceiling Surround Package (6")Whats Included Sonos Arc Ultra soundbar 2 Sonos Sub 4 wireless subwoofers Sonos Amp Pair of 6 in ceiling speakers (rear surrounds) Deep, Controlled Bass Across the Room The Arc Ultra delivers clear dialogue and expansive Dolby Atmos sound, while dual Sub 4 subwoofers provide deeper, more evenly distributed bass. Running two subs improves balance throughout the room, reduces dead spots, and maintains control even at higher listening levels. Surround