I have a5.1 setup and same thing here, and unfortunately it really started on Showtime and HBO for me a month ago (there is sounded more like just single pops). I've started watching those from the HBO and Showtime apps on my Xbox instead (sound is fine watching the same shows there). Watching avengers on TNT right now and the crackling is awful. I tried changing to Stereo Sound in the x1v4 box options and I still get the same popping. I'm running the sounds through an HDMI cable to my receiver.
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