To better understand the issue, could you provide the model numbers for your devices?
I recently purchased A Samsung led tv, blu-ray player and home theater receiver. All units are connected with high quality HDMI cables. When I watch a blu-ray or standard DVD, the dialog audio (people talking) is extremely quiet and the "other" sound, music, sound effects, etc, is very loud. I do have my direct tv going through my receiver and all that works perfectly. Note, to set all speaker levels, I used the "auto" feature my receiver offers. I placed the little mic in the center of my room, hit the button and all levels were set. Not sure if that is important but thought I would mention. Anyways, if any of you have any ideas, I would appreciate hearing them. Right now, I can't watch movies.