Long story short, I got a refurbished 2016 15" MBP, the speaker blew 3 times, each time they repaired it by replacing the top case and logic board until they gave me a 2017 15" MBP replacement. I thought the problem would be solved but it happened 2 weeks ago, sent in for repair again. Just this morning the speaker is blown again. How do I know it's blown? It happens when the computer wakes up from sleep and makes a zapping electric sound from one side of the speakers. Whenever I heard the sound, I would go to MIDI setup and test either side of the speaker, and the speaker that makes the zapping sound never fails to disappoint. Below is the YouTube video that shows a MBP that has the same symptoms. I'm really disappointed right now, every time I sent in the laptop it would take 1-2 weeks to fix. It's the 5th time the speakers are blown since I bought the MacBook Pro and it's only been 6 months. If I knew there were so many problems with the speaker, I would rather buy a normal Windows laptop... --- Post Merged, Dec 28, 2017 --- If anyone have any fix, or any ideas on how to take precaution to not break the speaker, please reply, thanks.