I read that artical explaining why theroretically we can not hear anything above redbook. I think the key is to keep improving coding and decoding of this standard. It would seam that the team that developed the CD standard where no idiots knew exactly what the standard needed to be for the human ear. I just got a Metrum Octave last night and I must say it takes another (huge) step forward in extracting amazing sound from redbook recordings. Also, recordings have gotten vastly better in the the past 30 years. I now have sound quality that I believe truly rivals analog, and it only took 30 years to get it. he he
Earl
Earl