Perhaps the human cutoff frequency of 20 khz is the problem here. While humans cannot perceive tones (continuous sine waves) above 20 khz or so, there may very well be a psycho-acoustic or other human response to high frequencies. The leading edge of a square wave, for example, has many ultrasonic frequency components. Those high frequencies may be perceived as an initial sound “attack” and may contibute to a sense of realism when reproduced correctly (proper phase and amplitude).
As an electrical engineer, with reduced high frequecy perception due to aging, I cannot explain why adding a supertweeter to my system makes the sound more spacious and realistic.
Btw, in my fairly pricey system, vinyl is superior to most digital, but both are very enjoyable. I think digital needs to increase the sampling rate throughout the entire recording to playback chain.
As an electrical engineer, with reduced high frequecy perception due to aging, I cannot explain why adding a supertweeter to my system makes the sound more spacious and realistic.
Btw, in my fairly pricey system, vinyl is superior to most digital, but both are very enjoyable. I think digital needs to increase the sampling rate throughout the entire recording to playback chain.