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Depends on what you mean as 'compatible'. You can add a new Sonos 1 to a system comprising a Play 1 and have a multi room set-up but you won't be able to 'pair' them as a stereo pair.
Just as a note, it's called the Sonos One, as opposed to the PLAY:1. I think they really wanted to differentiate them, by spelling out one versus using the numeral.
There is a link on the home page: "connect your Sonos to any Amazon Alexa device". But whatever - the important thing is you can do what you were hoping for.
I have two play 1s in front room set as surround sounds. tried to remove one of them and replace it with a one(alexa). Mixed speakers are not compatable as surrounds. The speakers must be matched pairs. The way i see it is a one is a stand alone speaker with alexa. Why would u have two alexa ones in the same room. Is it so they csn talk to each other lol. I think sonos will do a software update so you can pair the play 1 and one speakers together.