This sounds too much like The Voice – part of the Weirding Way skills of the Bene Gesserit … The article refers to tightly focussed sound above the pain threshold used to warn and then scatter opposing forces …

LRAD is a breakthrough long-range hailing and warning, directed acoustic device that is designed to determine intent, change behavior, and support various rules of engagement. With LRAD, a sentry can issue a focused verbal challenge with instructions in excess of 300 hundred yards, and follow up with a warning tone to cause behavior change. Recorded messages can be selected and delivered over LRAD in multiple languages.