Hi Lafayette, hearing protection is something that I am very passionate about.  I talk about it alot, but it always bears repeating.  Recently, I found an episode of Ask This Old House, which aired on February 12, 2015.  In a segment called Ask Kevin, host Kevin O’Connor teaches hearing safety when using power tools.  Unfortunately there are no high quality clips on youtube, so I have included a direct link to the video.  The specfic area to watch is scene 4.  https://www.thisoldhouse.com/toh/tv/ask-toh/video/0,,20900347,00.html

Enjoy,

Dr. Breitling