If frequencies abover 20Khz are causing audible differences in the audible frequency range then that's considered distortion and there's an issue in your playba

If frequencies abover 20Khz are causing audible differences in the audible frequency range then that's considered distortion and there's an issue in your playback chain somewhere. https://people.xiph.org/~xiphmont/demo/neil-young.html https://people.xiph.org/~xiphmont/demo/neil-young.html