From investigative journalist Brian Krebs:
Little Snitch reported today that Sonos tried to connect to a domain called tmp.sonoschina.com. I can't find much information about this domain, other than it is China-based but is out of a US ARIN IP block.
This is the first time I've seen something like that from Sonos. I said no thanks. I get that the hardware is made an assembled there, but this makes me worry maybe the data's going there, too.
A screenshot of the Little Snitch firewall for Mac OS asking whether to allow Sonos to connect to sonoschina.com.