Since 1983 one of the most memorable parts of going to the movies has been the THX certification played during the previews. The accompanying sound logo called “The Deep Note” has fascinated, terrified, and mystified audiences for over three decades. What is THX really? How was “The Deep Note” created? And why does it elicit such a reaction from those who hear it? Featuring Andy Moorer, creator of “The Deep Note” and global director of marketing for THX, Rob Cowles.