Ganito para walang malito...
1. If you will connect your HTPC / NMT to the "HDMI Input" of the Oppo BDP-103, the Oppo will downscale the HD Audio(DTS HD-MA or Dolby True HD) to its core audio(DTS / Dolby). This core audio will be the output of the "HDMI Out" of the Oppo going to the receiver.
2. If you will connect your external HDD to the Oppo using the USB connections and use the internal media player of Oppo, the Oppo will bitstream the original audio whether it's DTS HD-MA, Dolby True HD, simple DTS and Dolby Digital...
Take note that the internal media player of Oppo cannot play bluray iso / bdmv files, thus will not output the bluray menus...
If you have BDMV files, you have to go to the STREAM folder and choose the main movie file for the Oppo to play the movie. But iso files are totally not recognized...