Hi, I am not able to hear the voice sound tracks through the 520 in films when Dolby Digital is on, playing from my Apple TV. The other surround sound tracks play well (sound effects, music etc), the actors lips move, but the dialogue is muffled or inaudible. If I go into audio settings on Apple TV and switch Dolby Digital off, I can hear the voice sound track, but I lose the benefit of Dolby Digital sound. I am using a 3rd Gen Apple TV, cabled directly via HDMI into the Bose 520. This happens whether the content comes from Netflix or iTunes, so it appears to be a hardware or settings issue. I am sure it must be a simple issue to fix, but am not sure what I am doing wrong. I'd greatly appreciate your help.