Back in December 2020, Sonos added the ability to use two Sonos Subs in a dual-Sub setup; the idea is less about doubling the bass than it is delivering a smoother low-frequency response throughout the room. It's a nifty feature, but in the Sonos ecosystem, dual-subwoofer setups are exclusive to the bigger Sub. In other words, dual Sub Mini setups are a no-go.