I have noticed that on some DVD movies that I watch on my tv (HDTV 32" flatscreen Samsung), the voices of the actor/actress are not loud enough. I have no additional speakers, but the volume on the tv is turned up quite a bit. I start running into the problem of having to keep turning the volume up in order to hear the words, but then turn the volume down when explosions or other load noises in the movie occur. Is there a way to adjust something (like the treble or bass) so I don't have to keep changing the volume, or should I just buy a home-theater speaker system? Can anyone point me in the right direction? Thanks!!