I have a Virgin Tivo box in my lounge. The HDMI out from the Tivo goes to a Neet 2 way splitter (powered) which sends the signal to the TV, and to an AV receiver downstairs in the cellar. In the lounge I have the audio for the Tivo going into the lounges AV receiver via optical. Everything works fine, except the cellar isn't getting Dolby Digital only PCM (upstairs is fine). Pictures are fine and all HD as expected. Any ideas?