Hi again. Some HD channels broadcast 5.1. I appreciate this will be heard on the 5.1 surround system, but will this have any effect on the sound bar? The bar is the type supplied with the TV, and hangs under the TV as the TV is mounted on the wall.You have the attached soundbar and a receiver attached. I don't know how the bar is attached but if you have the optical output to the receiver then any audio problems may be down to the receiver's settings or your position of the your speakers. FWIW I just have the 802 so no soundbar but an optical connection to a Denon receiver and it sounds very good to me. TV audio and streamed content volume can differ from programme to programme and not all are in 5.1.
BTW, do you know of any info on the internet list preferred TV settings? There are so many settings, it all gets confusing.