I have a sony x8000g and a sony dav dz650 hometheatre. Got some movies with dolby digital 5.1 audio. When I load using usb drive to the hometheatre directly I get 5.1 output but only stereo when I load to the tv and use hdmi arc connection. How can I connect the two to get 5.1 audio output when loading movies to the tv? Loading directly on the hometheatre isn't a good choice since I'm limited to low picture quality.