Limit transmission range on a map

Hello, I am a beginner here and in Unity. I started adapting DemoVoiceUI to work as an external plugin for a game in C++. It gets the 2d position of the player on the map and sends it to the others as a custom attribute, so the volume is adjusted according to distance. Can I avoid sending audio between distant players on the map? There are around 200 players per map/channel. Thanks for the help.