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So, I have returned a bunch of Bluesound equipment and switched it all to Sonos.  One room has an Arc, Sub and surround set up and I would like to attache the Arc to a MantelMount MM540.  Had the Bluesound soundbar on their initially (which came with some mounting brackets/wings), and I am wondering if I need something special to place the Arc on there.  Looks like is will just screw right in and not sit to far underneath the television (OLED and pretty thin) so as to not block any of the speakers.  

Similar question here @mpg22. I’ve got the MM540 and I, too, was thinking that maybe the Arc will mount directly to the sound bar attachment with the proper machine screws. I ordered the Arc Wall Mount adapter, but am not so sure it’s even needed after looking at it further. And the hardware included with the Arc Wall Mount adapter is more geared towards mounting the adapter to studs/drywall. I receive the Arc on Friday and will let you know how it goes.


Found this in the meantime: https://en.community.sonos.com/home-theater-228993/beam-mounting-screws-6825707?postid=16336308#post16336308


And this: https://en.community.sonos.com/home-theater-228993/sonos-arc-mounting-screws-size-6842762?postid=16440282#post16440282


And this: https://en.community.sonos.com/home-theater-228993/using-the-arc-mount-but-turning-off-the-mount-magnet-settings-6842719?postid=16440106#post16440106


Was able to attach mine directly with some screws, a washer and some spacers to hold it secure.  Perfect!  Thank you.