Age and Ultrasonic


#1

Got one Question regarding Ultrasonic Subs. As some of you may know from the age of 20 on
your capability to hear high frequency sounds degrades continually .This loss of hearing capabilities is because of physiological changes in your ear .
Children and teenagers can still hear those high frequencies . So how useful is it for adults to use those ultrasonic subs and why ?


#2

Interesting : Is Silent Subliminal Audio Suitable for the Deaf?