I looked up radiosure.com with an online tool and that information says it originates from Moscow which explains the inability to reach it. It could be geoblocked, or just on blackout considering the state of world affairs. Which might explain the absence of Fonzy and other moderators from the different forums. I don't think he can get control of twitter account @radiosure even if he has access to internet. Source: about 2 years ago

I have a bunch of Sonos speakers and hooked them all up to a Mac running Airfoil (https://rogueamoeba.com/airfoil/mac/). It isn't perfect and audio occasionally de-syncs or a speaker drops out. On a dedicated wireless channel playing a local source I imagine it would be pretty solid. Not really an option if you don't have a Mac to run Airfoil, though if you do you can use the Satellite... - Source: Hacker News / 5 days ago

Within the house, I use Airfoil to stream between my computers and my systems. https://rogueamoeba.com/airfoil/mac/. Source: 11 months ago

You can use Airfoil to directly stream your song through your iPhone without having to bounce the song first. Source: about 1 year ago

You can also use an app like Airfoil from Rogue Amoeba for more control and output to Bluetooth and AirPlay devices as well as physically connected ones. Source: about 1 year ago

Have an explore of this software. Might be what you are looking for. Airfoil. Source: about 1 year ago