The DAC doesn't come into play you are still using your Pre/pro DAC either way. The decoding should be the same. The same bitstream input should output the exact same PCM stream no matter where the decoder is physically located. I guess you could argue that one or the other processor has a better codec implementation. Keep in mind that Dolby TrueHD is lossless so I would expect the PCM output to be identical or nearly so.

I guess I’m not being very clear. Think of the DD+ (lossy) or TrueHD (lossless) decoder as a black box. You input an encoded bitstream into the black box what is output on the other side is 24/96 PCM, whether it is in the player or the Pre/Pro. Maybe I should have made that clear earlier the output of the decoder is PCM no matter what. HDMI1.1 has more then enough bandwidth to transmit it, twice as much in fact as it can do eight channels of 24/192 and TrueHD is only 24/96 per channel.