Got to say I disagree with you, Mel. There is no profit in my link. It's there to demonstrate the specific nature of the sound. Wikipedia should not be a dead medium. In order to survive and grow, it needs to be relevant. Writing about sound is a like skating about architecture. It simply doesn't work. In order to convey the material properly, one has to hear what is being referred to. Text, no matter how erudite, fails to do this. The only way to achieve it properly is by using audio to demonstrate the specifics of a particular microphone array. I'm terribly sorry you presently don't  comprehend this. Why do I not see any tildes in your signature?

   Ty Ford