This Sonos bundle pairs an Arc Ultra sound bar with a Sub 4 wireless subwoofer, both finished in black. The Arc Ultra carries 14 drivers and delivers a 9.1.4 spatial audio experience with Dolby Atmos, while the Sub 4 adds dual force-cancelling woofers with Trueplay room tuning. Arc Ultra sound bar with 14 drivers and a 9.1.4 Dolby Atmos spatial audio experience Sub 4 wireless subwoofer with dual force-cancelling woofers and Trueplay room tuning This description was generated by AI and reviewed for accuracy.