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wasted effort, I gave up trying to teach Navman anything, especially ultrasonic theory.

He's a downer and he will bring you down if you let him.

And what you said made perfect sense to me and it does to Allen as well, as we perceive ultrasonic frequencies but they are not turned into sound but registered by the brain.

The cochlea - a spiral-shaped, fluid-filled inner ear structure; is lined with cilia (tiny hairs) that move when vibrated and cause a nerve impulse to form. These vibrate up to 80,000 times a second or 80kHz. The highest audible "sound" that can be "heard" is around 27kHz and that is when you are a teenager as you get older you start to loose upper hearing and many older adults are lucky to hear to 15kHz. But even if hearing is damaged in the audible range, in the super sonic range we usually can still respond up to the full 80kHz.

The ultrasonic frequencies are so safe from damage that many "deaf" people can now perceive speech by transposing it to the ultrasonic range. This is still in the experiment stage, but this is a very promising field of study and would have many positive benefits to mankind.

You are correct Allen has confirmed the importance of the frequencies between 50kHz - 100kHz by the removal of the 50kHz filters on SACD players thus restoring their 100kHz frequency response.

Give me high resolution or remain silent,

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