I know this has nothing to do with this website, but...I'm constantly having problems with not being able hear the speech/vocal portions of movies and tv programs. I can still hear them, but it is usually drowned out by the other sounds like music and prop noise. It usually results in me missing certain words or phrases. It doesn't happen all the time and has been occuring with several TVs with and without 5.1 surround. I've also noticed this happening on other peoples tvs as well. Is there a common way to fix this, and why does it occur?