Individual discs can of course vary in their results.
Reading this article again reminded me of a question I wanted to ask... I apologize if this has already been covered, if so I can't remember the answer.
Is it a fair assumption that the lossless audio tracks (PCM or DTS-MA, etc.) are actually the same mix as the lossy track? i.e. do the engineers first create the lossless audio mix and then run this source mix through the Dolby Digitial compression engine to create the lossy version, or are there two different source tracks to begin with? If it is the latter, it would seem that doing an A/B comparison on the effects of compression in your home is impossible. That's not to say you can't determine if there is a difference in quality between the tracks yourself, but if the source mix isn't the same, the differences might not be only from the effect of compression.
Jason
