When I watch Score, I listen to the 5.1 surround sound mix on my 2.0 speakers, which sounds a LOT better than the Stereo Mix, and much less compressed. Which is kind of weird that the 5.1 mix would actually sound better on stereo speakers than the proper stereo mix. But I'd suggest double checking that your DVD player doesn't accidentally put it on Stereo by default. I've had some wonky things randomly happen with DVDs, including automatic subtitles, and other stuff like that.