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Re: Speculation about cause...

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US Army researchers in the early 50's and Cal State researchers in the mid 90's verifed that even though humans can not "hear" untrasonic frequencies they are still aware of their presence. While ultrasonic frequencies are not heard, they excite the auditory mechanism, sending data to the brain, which is aknowledged on a subconscious level. The subconscious sensation enhances the percpetion of what is heard. In addition the same process is part of the reason why some consider the nyquist frequency to have a negative impact on the sound of RedBook digital.

Best,

Ross


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