The range should be extended to at least 75m.
The volume of Direct Communication should be easily adjusted in the menu, if not, added in as a scripting command so that servers can boost the overall volume for everyone connecting, and should be increased overall as it stands.
The "drop-off" audio is good, so long as at 75m you can't hear someone, at 50m its rather muffled, at 25m its rather clear, and at 10m or less its clearly audible and loud.