I recently purchased a Seiki SB201C sound bar which has output via analog or coaxial. The problem I'm running into is that my TV doesn't seem to be outputting the sound through the bar. I have my input as an Xbox 360 with an HDMI to the TV. Is this a problem with my TV not being able to convert the sound from the HDMI to the output of the sound bar? TV is a Sansui model #: HDLCD3250. And the TV itself is a few years old and has never been connected to external audio before.