Silent sound is basically a sound which bypasses the ears and directs to the Coaley region of the inner ear. Modulated Frequancys can penitrate this region tricking the audio cote region of the brain into hearing sound. Research has found that an over exposure to 14.8khz can increase hearing gain by between 20-30db therefore giving you the effect of increased sensitivity to this kind of attack, which is why they talk quiet and only you can preseeve it. (Sources coming soon). At the moment I havn't found a partial solution to stop this, I do however have ideas. I do know however based on previous research that they are interested in your alpha to theta wave lengths your brain gives off. A method I am seeking to get help with at the moment is basically a frequency scambler/jammer which scrambles or blocks your alpha to theta waves before they are even trasmitted in sense giving them 0 data to work with.. including the frequancy range monitoring on your inner voice. Remove the means to gather this crutial data escially makes they entire operation pointless which is where I am heading towards now. I have an extremely vast wealth of knowledge conserning this technology and aim to join with you to defeat this obtosity on human kind. Any questions I'm pretty sure I'll will be able to give you solid answer probably with proof to back it so feel free! Your not alone!!