i dunno why but i can barely hear the voices on a hd hdvd or even a normal dvd movie when i play them through my pc using power dvd. I have my sound set to 5.1 as i am using a 5.1 system too the actualy sound effects and music are loud but whenever someone talks it is always low. i tried the same movies on my different players and they sound fine.
also i cant get 5.1 with powerdvd yet i can get it with windows media player classic using my sd/pif digital out from my xtreme music card