The typical range in normal, open living areas is minimum 20 to 50 meters.
The test editors of the German television series "Galileo" have attained a range of almost 300 meters in a “toughness test” – without any sound dropout.
With the multiroom Xeo system from The Coffee Company in Amsterdam, this is only 12 meters, as a WiFi server park with several PCs and diverse routers impairs the transmission from the adjoining room.
So the range also depends on the environment, in particular existing WiFi networks, other radio and wireless devices, walls as well as unknown interference from adjoining rooms, as Xeo uses the same transmission frequency as many of these devices.