I have a Sony Bravia, model # KDL-48R510C. It has 2 HDMI ports. Port 1 is (ARC). The Roku Express must go in port 1. If I connect the home theater system to port 2, the TV recognizes it but does not play sound. The model number for the HTS is DAV-TZ140. What do I need to do to be able to use the sound system with my Roku?