Audio Spotlight

By April 19, 2017June 1st, 2017NEWS


The Audio Spotlight PrivateSound technology creates a tight, narrow beam of sound that can be controlled with the same precision as light. Aim the speaker at your desired listening area to keep sound focused specifically to your listeners and quiet everywhere else.

The more technology develops, the more personalized our lives become, and the less personal our interactions. It used to be that the living room was a place where families would congregate around the television and spend time watching local broadcasts together.

Now there are literally hundreds of channels and viewing options to choose from. With so much selection, it’s much easier to pick what you want, but your preference may not be what your partner, or your child, or parent wants. Maybe they don’t even want to watch, or hear, anything at all.

Audio Spotlight speakers are used to provide localized sound for those who wish to hear it, while maintaining quiet elsewhere. Producing a narrow beam of sound, wide enough to cover only a single person or two, the Audio Spotlight speaker allows every seat in the living room to be a different experience, and the home to be a more peaceful, and shared space.

Whether for taking the mute off split screen television so a couple can curl up on the couch together to watch two different shows, or for limiting those action movie explosions to the arm chair and not the kitchen island, Audio Spotlight speakers afford everyone their own personal taste without having to retreat to separate rooms in the house.

Audio Spotlight speakers can also be used to enjoy TV or music in bed, without impeding on a spouse’s ability to slumber soundly right next to you, or for increasing the listening level for the hard of hearing at a particular seat, without drowning everyone else out in the rest of the room.


The inherent directivity (narrowness) of all wave producing sources depends on little more than the size of the source, compared to the wavelengths it generates. Audible sound has wavelengths ranging from a few inches to several feet, and because these wavelengths are comparable to the size of most loudspeakers, sound generally propagates omnidirectionally. Only by creating a sound source much larger than the wavelengths it produces can a narrow beam be created. In the past, loudspeaker manufacturers have created large speaker panels or used reflective domes to provide some directivity but, due to the sound’s large wavelengths, the directivity of these devices is still extremely weak.

No loudspeaker can ever approach the directivity of Audio Spotlight technology.

Ultrasound as a Sound Source!

Since the goal is a small loudspeaker but strong directivity, the only possible solution is to generate very small wavelengths – such as those of high-frequency ultrasound. The ultrasound used in Holosonic technology has wavelengths only a few millimeters long, which are much smaller than the source, and therefore naturally travel in an extremely narrow beam.

Of course, the ultrasound, which contains frequencies far outside our range of hearing, is completely inaudible. But as the ultrasonic beam travels through the air, the inherent properties of the air cause the ultrasound to change shape in a predictable way. This gives rise to frequency components in the audible band, which can be accurately predicted, and therefore precisely controlled. By generating the correct ultrasonic signal, we can create, within the air itself, any sound desired.

Sound is literally made from thin air.

Note that the source of sound is not the physical device you see, but the invisible beam of ultrasound, which can be many meters long. This new sound source, while invisible, is very large compared to the audio wavelengths it’s generating. So the resulting audio is now extremely directional, just like a beam of light.

Often incorrectly attributed to so-called “Tartini tones”, the technique of using high-frequency waves to generate low-frequency signals was pioneered over forty years ago. Over the past several decades, many others have attempted – and failed – to use this technique to make a practical audio source.

Through a combination of careful mathematical analysis and engineering insight based on pioneering work at MIT in the early 2000’s, the patented Audio Spotlight sound system has become the very first, and still the only, truly directional audio system which generates high quality sound in a reliable, professional package.

LAST UPDATE 19-04-2017