Adding my voice as well on my "old" macbook pro 15 late 2013 running now on big sur 11.7.7
Sound always played well until the latest os updates.
there's no way to have the sound I had few weeks ago.
I am sure it's a sw/driver problem because pluggin in some headphones via wire the play fine.
I don't think speaker broke down because I use music at low volume but never the less even at low volume the noise is there all the time.
Again_you
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