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I assumed the a2 would at least output a regular DD 5.1 signal like it does for standard DVD's.
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It's an interesting/good/ironic point about the messy high rez aud codecs and their disparate implementation on high def disc: HD DVD embraced lossless aud in the form of Dolby TrueHD in a way BD did not (thus all the PCM on Disney and Sony BDs). But, BD players can extract a "core"/"legacy" DTS signal from the DTS-HD MA tracks on all those Fox discs, whereas HD DVD players can't extract a "core" Dolby Digital signal from a DD+ track. Instead (since I think Dolby Digital maxes out at 648Kbps?), a 1.5Kbps DD+ track has to be converted to the higher bandwidth DTS format.