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I currently have 2 speakers (a stereo pair) connected to my Sonos Amp. I’d like to add another speaker (just one) to the Amp but have it be mono (ie, play both left and right channels combined). Is it possible to connect 3 speakers to the Amp but have 2 of them be stereo and 1 be mono? My fingers are crossed that there’s a clever way to do this. Thanks.

No.  There are speakers out there which combine two channels into one.  They are mostly in ceiling types for use in closets or bathrooms.


However, a simple use of another Sonos speaker, ‘grouped’ with the Amp’s room,  would give you what you desire. 


There are transformers that can do this. I think a single point stereo speaker is a better choice.