You can try the loudness correction. It's right click the speaker icon in the lower right, playback, highlight your speakers, properties, then the enhancements tab. That will boost quiet sounds and lower the loud sounds pretty well. I use it cause TV is crap some programs the people whisper at each other and then there are the sitcoms where everyone is yelling. Not saying this is the solution, but it might help.
As far as the solution, what speakers, what operating system, what hardware through what connections... There are so many places where something can go wrong when you get all technical.