Julf wrote: 
> Really? Why would you need quality control when everyone will hear a
> night and day difference between "hi-res" and red book? :)

;-)

Good point. The ultimate test of any audio file is whether or not it can
be detected in comparison using a level-matched, time synched ABX test
comparing it to a file of the same music with reliable provenance.

Difference testing and other tests based on mathematical comparisons are
not reliable because they can an give positive results whether the
difference is audible or not.


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