Jack Yoest's post should be read by every pastor, church sound man, and person who ever make an announcement at church. He is addressing the use of microphones and public speaking. I don't know how many people I see making adjustments to microphones and it really does nothing at all. If it is a little high, well your probably struggling anyway to be seen in the first place. Enough from me, follow the link.
Jack Yoest at Yoest.org: "If you deign to be interviewed by a reporter, or instead will speak at a planned, orchestrated press conference, here are 7 tips to remember for the handheld or externally fixed microphone.