There was information in the news about some type of inaudible sonic device which has caused some hearing loss to a few US/Canadian diplomats stationed in Havana, Cuba. Canadian Diplomat in Cuba Joins US Officials in Suffering From Hearing Loss I am curious to speculate exactly what type of device could it be? Outside the audible frequency range and affects the ear so that there is loss within the audible frequency range? I don't know much about hearing loss, nor do I know much more than the news articles as to what type of hearing loss: certain frequencies or across all audible frequencies? How much hearing loss did they experience? Fully deaf or going deaf? Is it permanent?