A crackling MacBook speaker is both annoying and disruptive, regardless of whether you’re watching television, listening to music, or having a conversation in a virtual meeting.
It can be difficult to pinpoint what is causing your MacBook pro speakers to crackle, especially if it isn’t linked to an individual app, in which case the software of that app usually causes the problem. You may be able to find one that stops the crackles and pops by working through the following remedies.
Read more here: https://www.soldrit.com/blog/how-to-fix-macbook-pro-audio-crackling/