I have my mbp since September. I have an issue where there is this quiet crackling in speakers. It's not very noticeable in loud environment, but it for sure is noticeable in silent environment. Since I had this issue I tried downgrading to Catalina, reinstalling Big Sur but nothing helped. It always started after one day again. My mbp was in authorised apple service where they changed speakers and reinstalled my system, but that didn't help as well. I also noticed that when I run windows through bootcamp, the issue disappears. The guy in the service told me that I have beta version of firmware, but I don't know if this has anything to do with that. I also ran apple diagnostics and there seems to be no issue with hardware. I feel like I've tried everything, but nothing helps. Does anyone know what can I do with this issue?