I just wanted to post this because I couldn't find a thing online in any forums about this issue. Our blu ray player started playing movies with lower voices all the sudden. Other than the fact that everyone sounds like James Earl Jones, everything else seemed fine... I found some info on voice distortion but really didn't feel like it fit with issues we had. We even tried other movies, all with the same result. We fixed the issue by direction from LG's customer service to do a "Hard Re-Boot"
1. Unplug the power of the blue ray player
2. While unplugged, press and hold the power bottom for 30 secs
3. THEN plug the machine back in again and power it back on.
The issue should be resolved. If not, I encourage you to call their customer service after attempting this first.