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“Sonos opened the door for all of there speakers to be controlled by Amazon Echo or Echo Dot on October the 4th.”
While I do question this site (it does all seem a bit AI to me) It does not mention the Echo sub - that looks to be an addition to the Echo system- but only Echo devices that can control Sonos. Controlling Sonos via Alexa works. Adding a non-Sonos wireless sub like the Echo sub does not.