Check the wiring connection (both on the receiver and the speaker itself) for the center channel speaker. That's where most of the voices come out of in a surround sound configuration.
Keep me posted.
I have a Samsung HT-TZ512 Home Theater System hooked up to a Sony Bravia KDL-52V5100 & when I play DVDs, I can hear the previews that are on the rented DVDs & music and all, but when the actual movie starts playing, you can barely hear the voices. Has anybody had any problems with this? I'm thinking something is wrong w/ the HTS.