Alexa chime on Sonos one

I can confirm that there isn't an option for the Sonos One to turn off the tone that's played when Alexa hears you. It's intended as a feature to make sure you know when it's active. We'll pass on the feedback to the team that you'd like the option to turn that off. There aren't any announced plans around this feature yet, but we'll make sure the team knows you're interested.