Every BD player and universal player(I've never had a BD universal) I've had...
SACD and DVD-A had to be set up from the default of 2.0 playback. Even my newer HDMI players defaulted to 2.0...till set up.
BD players(the ones I've had) were set up PCM downmix. PCM downmix is default because...
Since I don't know "what exactly" is your confusion about what it decodes...or has to...
SACD. This player can either decode SACD as MCH and pass it over HDMI. Or it can pass it over as DSD if your AVR handles DSD.
DVD-A. All DVD-A players decode this internally.
DTS HD. If set bitstream, the...