crackling sounds from soundbar

I have a Toshiba 55G310U TV and a Polk Audio soundbar 4000. When viewing TV the sound is great. When I play music from iheart or Pandora I get crackling sounds through the soundbar. The audio connection is a digital optic cable and I'm going through a RoKu box. Help!

Answers

  • Which Roku are you running?
    The TV does what type of input to the soundbar?
    The Roku does what type of audio connection and does it connect to the soundbar or tv?
    More info and we might be able to chase down the ghost in your connections.