Do you know of any people whose voices carry well over long distances?

I can think of two people in particular, one at work and one at the local B&N. They are not shouting. It is not so much that they are loud, but I can easily make out what they are saying from a couple of hundred feet away. I might be able to hear the person they are having a conversation with but not make out what the other person is saying. I did a Web search and found this. The first answer seems to make sense. I wonder if it is the whole story.