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My MacBook Pro is making a muffled sound and is crackling, but I am unsure whether I should replace the large or the smaller speaker to resolve this issue. Also I cannot find a guide that shows me how to replace the speakers on MacBook Pro A2251 please help?

This is a 2020 MacBook and should be under warranty. Book an appointment with Apple or give them a call and they should repair it for you. Don’t try and open up a machine that is under warranty