I wish I could find the link, but I was reading something the other day on hi resolution audio and it talked about why Redbook CD is more than adequate to exceed the human capacity for hearing. The interesting thing was that the high res media could include things behind the range of human hearing but in some systems it could actually cause distortion in the audible range. It seems that higher could do nothing if you can't hear it, but could add distortion within the audible range under some circumstances.
Don't worry about what you can't hear, just judge based on what you can.
Don't worry about what you can't hear, just judge based on what you can.