Originally Posted by rbinck
you will need to turn off the internal TV speakers and either set the audio output to fixed rather than variable or put the volume all the way up. Then use the sound system remote for volume control.
That did it. I was not looking far enough back in the setup menus.
My next task is to decide how, and if I want, to get a snake and thread the cable to my rear speakers under the carpet. Considering the way the room is set up I doubt if they would be very effective.