This should make sense. If your file is originally PCM it is best to play as PCM so naturally PCM should be better still. DSD conversion would be losing something, esp on the fly. It means the R2R DACs are really good in playing PCM and you can do this direct comparison on the same DAC.The next step is to get a DSD file (recorded natively in DSD, and never gets converted entirely to PCM for mixing, or recorded/mixed in analogue & transfer to DSD), and compare to its PCM version of the same resolution (via conversion on the fly and also get the actual PCM file if actually available). And see which one is better?