You must use HDMI . Optical (Toslink) cables do not have the bandwidth to carry lossless DTS-HD Master Audio or DTS:X.
The classic 5.1 lossy format. It typically runs at 1.5 Mbps, offering higher fidelity than standard Dolby Digital. hdencoderscom dts
The playback quality was, for the most part, stellar. The DTS-HD files were the standout performers. If you have a home theater receiver that supports DTS-HD MA, the dynamic range available in these files is staggering. The separation of instruments in a 5.1 mix on a properly calibrated system provided that "you are there" sensation that audiophiles You must use HDMI