&gt; I do believe they claim that they use inaudible sounds...<p>The odds that <i>a</i> television manufacturer [0] has designed most of its TVs with speakers that can reliably reproduce either ultrasonic or subsonic frequencies are near-zero.<p>The odds that the marketing arm of a niche tech company will be dreadfully (<i>some</i> might say fraudulently) imprecise with their marketing copy are <i>really</i>, <i>really</i> high.<p>[0] Let alone most-to-all of them.