said by bogey780 
:The optical SPDIF issue is just one of standards. They support Dolby and DTS just fine but it can only send the signal compressed to the receiver for decoding. HDMI 1.3 allows for 7.1 uncompresed PCM.
I don't have a link to confirm this but I've been told this by many audiophiles as to why I can't get 5.1 PCM across my toslink.
I wonder if it's kind of like trying to get a 10mbit NIC to work at gigabit speeds. It's not that the fiber itself can't handle it, rather the receiver (or transmitter) is using a outdated technology that doesn't work fast enough.
