This Sonos bundle pairs the Arc Ultra sound bar with the Sub 4 wireless subwoofer and a pair of Era 300 multi-room speakers in white. The Arc Ultra carries 14 drivers and supports Dolby Atmos for a 9.1.4 configuration, the Sub 4 uses dual force-cancelling woofers for low frequencies, and each Era 300 disperses sound left, right, forward, and upward. Four separate Sonos products: one sound bar, one subwoofer, and two multi-room speakers Arc Ultra supports Dolby Atmos in a 9.1.4 configuration with the Sub 4 handling bass This description was generated by AI and reviewed for accuracy.