I have a 15" 2018 MBP bought from the official apple website with better cpu, gpu etc. Price was around 4k euro's and I have been having lots and lots of these crackling noise issues with this mb. I have had it happen about 100 times since I bought it that the speakers started doing it at random intervals, not only when stopping and starting music in iTunes etc. because that also always happens. Sometimes it would just start doing random crackling noises etc every couple of seconds forcing me to reboot because it sounded damaging to the speakers and to my brain. After rebooting sometimes I didn't experience it for a couple of days and sometimes I experienced it again short after reboot so I can never pin point what causes it. I have called time and time again but Apple support always blames it on my software and they tell me to reinstall MacOS, send movies made with a camera, do system checks, don't use time machine backups, don't use developer updates, etc. etc. It has driven me nuts and iv'e lost so many hours with the rebooting reinstalling and hopelessly searching.
Finally Apple support told me to bring it in for repair so I did. The shop replaced the entire top-case, gave it back to me and a day later I was forced to reboot again because of completely random popping and crackling every couple seconds!!..Once it really starts I always need to reboot and then it works for a while (except for the crackling when skipping music etc).
I returned it again a second time for repair because apple doesn't want to replace it for me before it had two repair attempts. Second repair attempt, they can't find the issue for two weeks, blame it on YouTube when I desperately try to let them hear the issue in the shop on a clean install..Now apple support says it still doesn't count as a second repair because they couldn't find the issue the second time. So now I'm back to one year ago and I have to prove it all over again. They say that I have to prove it with video's of it happening again so I have been recording my mbp for about a week now constantly listening to music, hoping I starts doing it at random intervals again so I can prove it is a hardware issue and maybe then I can get a replacement if I beg hard enough. Now I'm hoping for it to happen and now it doesn't happen at random (still hear it when skipping music) so FML..
I really had it with this MBP, Apple, and Apple support.. I just don't want to spend the next couple years with an expensive investment that sticks needles in my ears whenever it feels like it.
Don't think I will ever again buy another MacBook if I don't get a replacement for this machine because I never experienced anything like this on the three other MacBooks that I've used in the past so I know it shouldn't happen.
Apple please start a recall for this hardware issue!!!