what im trying to say is that to "hear" requires pressure and vibration for the ears to hear. To keep the sound so only you hear it is the tricky part of figuring out how they are doing it to you. What im saying since they contain it, they use vibration against the ear parts into the brain itself. you can resist it over time by mentally visualizing the sound energy go out to your ears so the brain does not receive more than a light sound thats tolerable.