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Since I can unplug the speaker and it still connects to our WiFi and remembers the account when it’s plugged back in, I assume that the software includes some sort of memory chip that retains the ID. Am I correct?

Yes. It should. 


The software lives on each speaker. The controller is merely a remote control that reaches out to that. There is some memory in each Sonos device that lives across power cuts, and stores all the data. 
 

Each speaker is a three in one, a speaker, a computer, and a WiFi card, with all the things associated with that. 


Thank you for your very helpful reply. One more question. If the speaker is unplugged for a lengthy period of time (for example, a month), will it remember the configuration when it’s plugged in again?