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I would like to build two In Ceiling speakers into my concrete ceiling. Creating the 210mm holes isn’t an issue, however I wouldn’t be able to turn the clamps behind the ceiling like in a wooden ceiling because all I got is a straight hole.

How is the mounting typically solved in concrete ceilings? is there a mounting bracket available for this? Other solutions/suggestions?

Hello @Bjorn Douchy, welcome to the Sonos community!

I would advise you to check out the user manual for the In-Ceiling Sonance speakers.

In case the user manual does not provide the necessary information, I would suggest to get in contact with a professional installer

They are able to inform and assist you with any questions that you may have regarding the built-in products.