While it’s true some animals have the ability to produce sounds at frequencies below which we can hear (“infrasound”), I’m not aware of any studies that show it’s used to stun prey. At least not by terrestrial animals, but perhaps in aquatic predators. It’s been hypothesized that tigers and other big cats have this ability, but not proven. It is certain that big cats do not go around roaring while they hunt. They are silent, ambush predators. Your mileage and opinion may vary 🙂