Sound Goes Down And Hard To Hear

I use media Center with Media Browser because it is supper easy and supper organized way to display videos and movies and tv shows from main menu of Media Browser. Setting is also very easy and it works inside Media center. Movies Quilty and sound goes down or get dim or it hard to hear the movies. In some movies such as Blu - Ray H264 1080p i have to bring my TV sound option to 100% to berly be able to hear sound. Same thing goes to Video. i really would love to get this fixed I am using Media Browser with windows media center