I have an old Onkyo SR601 which doesn't support HDMI interface. I want to know whether it can play back 5.1 channels of audio from a blu-ray player through the optical digital audio input.
If the blu-ray movies come with Dobby Digital or DTS like regular DVDs, i think the receiver shall not have any problem. But most blu-ray titles carry only the Dobby TrueHD audio format. If I use the optical output of the blu-ray player, does it internally convert the HD audio into Dobby Digital or DTS then pass them through the optical cable to my Onkyo? If the player only decodes the HD into PCM, would the optical cable only pass two channels?
Another hook-up approach is to link the player with HDTV using HDMI and then use the TV's optical output. Does this make any difference? Would TV internally do any decoding stuff?