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Question: Just bought it, but no sound???

I have it connected with a digital cable to my PS3. My PS3 is connected to my Sony Bravia Flow-motion with HDMI. I can only get sound from my TV and not the TH-BA3. What am I doing wrong? I also tried hooking it directly to my TV, like I had done with my Bose cinemate, but still it doesn't work. Can you help?