There now exists a technology that projects calculated ultrasound frequencies to the listener’s position to excite the actual audio frequencies at the ears. This actually allows the rest of the room to remain quiet! So in essence, wireless headphones, without the headphones.
I think this could be utililized in conjunction with any speaker technology to enhance the sonics at listener position. Probably could be used as a type of supertweeter, etc.
That sounds like scifi to me. A promis too good to be true.
Imagine the energy needed in those ultra frequencies to dampen the lower frequencies (all!)… in all other positions in the room, except where the listener so happens to reside (BTW, speaking of one or more simultaneously, and how?).
And if it’s possible, are we talking true spatialy correct audio?
No, it’s already done. It is very directional and as said, it’s more akin to headphones, without the headphones. It works.
really?
when i “hear” the Ultrasonics, it has always been associated with listening fatigue…
how would this approach to listening be any different?
I had seen this before but it is anything but audiophile.
It’s using sonar “beat frequencies” to use the non-linearities of air to create audible sound
Highly directional but no low midrange and bass (only maybe response from 500 or 1 kHz and above). Lower frequencies can’t be produced at sufficient output/distortion and (distortion is quite high already) and the low frequencies are not able to be hyper directional in the same way anyway.
These are primarilty used in museums and kiosks to larget a single listener with information
Thanks for sharing anyway. Examples as Chris shared certainly have their use cases and are interesting enough.
Meanwhile at home, I’ll keep my current rig and our forum entertainment for the time being! 
Yes, but how about the capability above 20kHz?