Dan,
You're definitely not hearing DVD-A content. If the 'Road to Perdition' DVD had 6 channels of losslessly packed 96/24 PCM data, there would be no room for the video signal. Your experience, though, seems to indicate that you preferred how the DD decoding was doen in your DVD player compared to the DD decoding in your processor. Surprising.
Best,
Sanjay
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Sanjay