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I am worried the answer to this question is one pair only. Anyone know ?
It only has one pair of outputs, but I believe it was addressed at the announcement that it can handle up to two pairs, assuming you don't overdo the impedance.
See the support document below for attaching 2 or 4 speakers. if you wish to add more, I'd get a good speaker switch.



https://support.sonos.com/s/article/265?language=en_US
Would like to know it also
As stated in the link above, it will power 2 pairs of 8 ohms each.
I’m using the Sonos Amp to power two sets of Polk RC80i’s (four speakers total) in my outdoor pavilion and the sound is incredible. Great range and loudness. Pic shows two speakers on one side of the pavilion.