Holy shit, Obadiah is right, the Army should have totally jumped on that. It's a freaking nonlethal way to totally immobilize enemies, resulting in no apparent side effects. Sounds can be amplified, right? Load one of those into a tank and give your soldiers those nifty earplugs Obadiah uses, and war has just become 100 percent easier. In fact, you know what else that would look great on? A fucking crime-fighting robot suit.
"Look, I only had enough room for that or the porn. I made the right call."
Tony's entire objective in this movie is stopping his company from building things that kill people. As Iron Man, he deals constantly with situations where civilian casualties are an issue -- we see him dealing with hostage takers in this film by utilizing a sick multi-kill sharpshooting device from his shoulder. It's wicked boss, but probably not as boss at the whole "not killing people" thing.
But hell, that instant-immobilization device would actually be a hell of a lot more useful to an army than that super-expensive Iron Man suit. Even in the films, there's no conflict that couldn't benefit from this device. Every villain that Iron Man has fought so far was a person who had ears, and that means they were all susceptible to this.
"Mind waiting for me there for 15 minutes while I get something to drink?"