that might be something to do with the audio properties or it might be because of the movie. most movies now use Dolby Digital 5.1 encoding. this works best with a 5.1 speaker setup,which is: front left, centre, front right, real left and rear right satelittes, aswell as a subwoofer. the centre speaker handles all of the speech, so ur sound may be distorted because of ur speaker arrangement, or u dont use a 5.1 speaker system