1.Setup a dedicated server for Arma3 with
VonCodecQuality=10
2. Load up a mission with at least 2 players in it.
3. Join the mission with at least 2 players
4. Use Direct Channel and observe how the voice comms can be heard quite clearly up to 80 meters.
5. Repeat the above with a channel that both players are not in e.g. vehicle channel (when players are not in the same vehicle or vehicle at all) and observe how the voice comms can be heard quite clearly up to 50 meters.