georgep86,

Either the player - or the disc menu - has selected 5.1 audio. If this happens, the center-channel voices don't come through. Try to set everything to stereo, and you should get a satisfactory result.

Bitstream wouldn't work, because then the TV has to decode the sound and downgrade it. Definitely try PCM, and set the output to Stereo both on the disc and the player.

--HDTech