The D to A converters are indeed 192/24 but as you said, we don't know if the DSP in between the HDMI input and the converters will pass the 192 content unaltered.
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Eric Desrochers
http://www.blu-ray.com/community/gallery.php?member=Deromax

" I hear no highs, I feel no lows, it sounds like crap, it must be Bose "