It would also be nice if the location of the speaker was in, say, yellow. That's the most important information after all, and currently it's very difficult to make out where reports are coming from... That makes reporting of enemy sightings or of a need for assitance quite useless. The only thing you succeed in doing is to alert the enemy of your presence.
With the current voice system, it's next to impossible to pin-point where the sound is coming from, so we do need some aid on the field. A distinctive colour might help.