Perfect with XR18 mixer
A known fault of the XR18 wifi digital mixer is that the built-in router disconnects if there are too many people (=too many smartphones present). For our music group, this happened with just 30 people. I bought this router recommended by the forums.
With this router, no problem with 60 people on the 5 GHz band on visible ssid and password.
The forums recommend a hidden ssid but I haven't managed to connect in hidden ssid? Windows or router problem: I don't know. I've taken off one star but maybe that's not deserved.
I hope it will become a visible ssid with a larger audience!