&gt; ...unless they&#x27;re starting to design TV&#x27;s exactly for these &quot;enhanced viewing experiences&quot; and opening up a side-channel of profits to marketers and folks like Nielson.<p>This presumes two things:<p>1) Enough TVs are made with speakers that can reliably reproduce <i>actually</i> ultrasonic or subsonic vibrations.<p>2) Enough microphone ship on devices that can reliably detect <i>actual</i> ultrasonic or subsonic vibrations.<p>I don&#x27;t see this happening any time soon.<p>Hell, it&#x27;ll be easier [0] to get this sort of information from the cable company by way of the cable box attached to the TV, or easier <i>and</i> (probably) cheaper to get this info from video playing software [1] that runs <i>on</i> the TV, or the inbuilt CATV&#x2F;OTA tuner. [2] Maybe mix in an approximate headcount from the camera embedded in the TV to &quot;enrich&quot; the data.<p>[0] From a market coordination perspective.<p>[1] YouTube or Netflix &quot;tuners&quot; or whatever.<p>[2] Assuming TVs even ship with those anymore...