Huh? No DTS? It shouldn't be a case of "choosing" DTS, since the 990 should automatically detect it and kick in the DTS decoding. There's the classic question - do you have the player's DTS output set to bitstream (which has finally started becoming standard) or PCM? - but I read your post to say that you've already checked that. The other classic question - have you picked DTS from the disc's menu? - I suspect you've also addressed.