I've just called a friend, he has bought the DVDs, he'll come to my place later, I'll plug in my stereo on my dvd player and I'll TRY to have it in a 5.1 configuration (my stereo has 4 loudspeakers plus subwoofer), althought I have no idea how to do it, and I'll try to listen to it carefully so I can notice all the problems with the audio, I should be able to notice it...