Hi @Jalol, Thank you for reaching out and welcome to the community. I’ve tried to look up the information that you’re asking for the dimensions of the disc on the powercord of the Sonos Arc. But all we have are the one's on the product manual, dimensions of the Sonos Arc unit itself. I’ve checked this as well with our specialist, and those are the only available information we have in our end. We may wait and check for feedbacks of other Sonos community users if they have answers or this inquiry. 

Let us know what you have in mind with the advice above.

The Sonos community is always here to help.