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Yes, the Sonance speakers need something to power them, normally a Sonos Amp. An no, due to the technology that drives both kinds of speakers, there currently are no Sonos speakers that will “pair” with, or play simultaneously with Alexa (or Google) speakers.
You would however, be able to control any speakers connected to the Sonos Amp with a voice control system. They just couldn’t be in sync with non-Sonos speakers.