Well. I think I am not the only one who got annoyed by the radio in Arma 3 Multi Player.. That "1 fall back" "4 Is down..6 is down" And all that thing what spams you on Multi Player. This is useless messages on multiplayer i think it should be deleted. Just Let the thing when you spot an enemy so you can announce you've spot an enemy like "Enemy UAV 100 m North-East" (that's only an exemple)
Now to Microphones. Well, I think the Direct Speak (To speak to nearest people) Should be like in Arma 2, that depends of your location like. If your a bit fare on my right I should hear only on the Right Speaker and a bit lower and so on.