Check your TV sound output options. There are a few configurations for the HDMI and Optical sound out ports that likely need some attention. I usually look for “auto” or Dolby Digital 5.1 but there are other custom settings as well. Also your source device(cable tuner, Apple TV, disc player), what are the sound output settings?
Thank you for the posts and I'm sorry to hear about the audio quality issue you're running into.
As @rickatk mentioned, I would suggest selecting Dolby Digital on your TVs audio settings to see if that helps. If that still does not help, do you have another TV in your home to test the Soundbar 700?
Let us know the results.
Thanks for your help on the community, it's always appreciated.
Joel - Community Support