I’ve had this issue a number of times before but it was never consistent enough to start to put together what was actually happening. I finally noticed a pattern and wanted to write in about it.
When watching a show with Dolby 5.1 (no difference between normal Dolby signal or Atmos), for some shows that have loud atmospheric background sounds (e.g., American Horror Story, Altered Carbon, etc.), a persistent and rhythmic cracking/popping sound will start and keep going for a period of time. I don’t really know what reliably stops it other than sometimes it stops on its own and sometimes it stops when I switch sources or shows and come back to it.
I connect my LG C9 TV to the pulse soundbar 2i using a high speed HDMI 2.1 cable. The cracking sound happens regardless of input source (Apple tv 4K, native LG apps, x1 box, etc). It also in unaffected by eARC being enabled or disabled.
I was originally concerned that this was a cable issue. What I discovered is if I switch the HDMI output from the tv from Passthrough to PCM, it stops the cracking/popping sound entirely. If I switch the output format back to Passthrough, the popping sound will resume.
I’ve read some people have experienced this issue due to connectivity problems with their internet connection. I’m not sure how that would be the case here since I have gigabit internet, and I have cat7 cables connecting all devices (Apple TV, sound bar, tv apps, etc) directly to/from the router.
Is there any way to reliably fix this? Right now my only solution is to flip audio output to PCM which isn’t ideal since PCM output from my tv is currently limited to stereo (multichannel PCM is supposed to come via an update in the coming weeks).
Related - is there anything in the works for the soundbar supporting 5.1 multichannel PCM? Or does it already?
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