I'm experiencing low sound levels on the DVD input on my STR-DA3ES. I have a Panasonic RV65 player connected with the optical cable and I have to turn the volume almost to 12 o'clock to get acceptable volume. (Even then I'm still not registering 75db with my Video Essentials disc.) I'm pleased with the sound quality at this level, but once I switch to a different source I just about get blasted out of the room. Is this a normal thing or do I need to check out a setting somewhere?