My MacBook speakers have started crackling on every sound since macOS 26 Beta 1, the problem is still the same on Beta 9. Happens especially when Simulator is opened.
Crackling speakers on MacBook M1 Pro
Yes, I have the same (currently on my M4 Pro, previously on my M1 Pro). Specifically noticeable if you are running music in the background while working in Xcode. The 'solution' I have is to kill the audio daemon. It will then auto-restart and it's ok for at least a while. Use: 'sudo killall coreaudiod'.