cleeds—I'm not personally aware of any other evidence of controlled double-blind testing that indicates a statistically valid audible distinction between redbook and higher rez alternatives. That's why I was interested to see your reference, although disappointed with the result.
As previously noted, all prior evidence (from controlled blind testing) had always indicated no statistically valid distinction between redbook and higher rez. And the general consensus is that redbook has only improved in the recent decade, as DACs have progressed.
As for "appreciable", hey, that word isn't a subjective term. It simply implies obvious, or readily capable of being perceived; i.e., hi-rez presents no readily apparent (no "appreciable") advantage. That's what the available evidence indicates. Personal exceptions are inevitable; some might be valid, others might be the outcome preconceived bias.
