This cable worked from the old Cable Box to the Auvio soundbar. We're in the processing of switching over to FireTV. I've plugged the digital optical cable from the LG TV to the soundbar. No sound from the soundbar. Only sound from the poor quality LG TV speakers. I've tried the LG TV audio settings in both the on and off position - no sound from the Auvio soundbar. What do I do to get sound from the sound bar?