i think some of those boxed old material re-releases just had no QC 
going on. they just don't care, or if it got out wrong, then they 
aren't going to fix it.

theatrical releases seem to follow the correct guidelines for 
preservation of dynamics (-20dBFS = 0VU reference, dialog properly 
done).  a calibrated playback system could, might, maybe, give you 
proper theatre reproduction on such a disk.

however, there's no such standard for non-theatrical releases (such 
as surround concert disks).  so they are big, just like the concert 

nor is there any standard for the special features, which are often 
authored by another company, or special features inserted at the last 
moment, produced by someone else.  .... and there's no final overview 
(on many disks) of comparative audio levels between the main feature 
and the bonus craps.

i mean, tracks.

a few people do this, who really want a great product, and give a 
mastering engineer a chance to make sure all the pieces (even the 
loop music for menus) is all properly done.   for sure, there is VAST 
amounts more Quality Check and punchlist work to do on this new 
media, and most people fail at it.

one big caveat: most DVD players have built-in dynamic compression. 
most SONY players have it default to "normal" which is not normal at 
all; after a near debacle after a client reviewed a Reference copy, 
it was found (after i insisted there was something Fishy About the 
Player) that the "normal" setting was hardly that; instead they 
needed to select "wide" range, which was actually unaltered playback 
dynamics... although it was never stated so in the manual at all. 
weirdly, this only affected the discrete analog outputs and not the 
digital out (makes no sense, eh).

w/best regards,
mastering engineer

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Things are not what they seem to be; nor are they otherwise.
   -- Lankavatara Sutra