I coudn't find any signs of a manual for it either. I'll borrow an example from a Panasonic plaer, though - it's a pretty typical setting option, and often defaults such that DTS won't work. Under Audio, there should be an option for DTS digital audio that offers either bitstream or PCM. You don't want PCM, which it may have defaulted to. You do want bitstream, which passes the DTS signal with no changes. This setting is defaulted to PCM on many players to prevent DTS signals being passed through the digital output to receivers that do not support DTS (which was much more common four or five years ago, but pretty darn rare today).