Just want to chuck in my two pobble beads... Running an MBP 16" 2019 (8-core i9 2.4GHz, 64GB RAM, 8GB 5500M, 2TB SSD) bought May 2020. No problems at all until a few days ago when crackling started from my left side speaker grille. Tried resetting SMC, NVRAM, changing speaker format to every available frequency option, rebooting, using Terminal and Activity Monitor to play whack-a-mole with coreaudiod... Nothing worked. Re-installed macOS Monterey (12.0.1) yesterday and the issue disappeared. Until today. It's back but, er, only sort of. Occasionally, I hear crackle but not as much as I was experiencing when the problem first made itself known. But it isn't constant. It occurs when playing music through Apple Music, playing video through Apple TV and when watching video on YouTube (via Safari 15.1 or Firefox 94.0.2), and when running games on macOS or Windows 10 via Bootcamp. Annoying doesn't begin to cover it. Apple needs to get this sorted. This issue has been affecting users of MBPs and MBAs for years now. Ridiculous. I'm posting simply to share info.