Sorry to not respond for so long. I came up with the same solution. I realize the soundbar R and L speakers were putting out similar crackling cutting in and out and turned down the center below 0. I like -30. This puts the primary audio to the left and rights (also rear) and no longer sounds bad.
I still have static coming from all the speakers when no audio is coming through the speakers. It isn't very noticeable in most settings, but in quiet movie scenes, it drives me up the wall. Seems to be something with the soundbar itself as it is heard from the soundbar speakers as well as the rears. I've played with the wireless router to troubleshoot wireless interference but nothing seemed to make it go away. I'm going to try a different surge protector or something along those lines and see if that helps.