Macbook Pro speaker gets muffled

Solution 1:

I've experienced this issue and after a complete re-install and every troubleshooting regarding software tried out, I handed it in at an AASP. They determined the issue to be hardware, and exchanged the top case (which also means no more sticky keys).

So my best advise is, take a backup and go visit your local AASP.

Solution 2:

I've been experiencing this problem for quite a long time, at some point it hit me that, this probably something to do with with driver, since switching frequency on midi settings fixes temporarily

I've been using eqMac (github) a system wide equalizer which installs it's own drivers seems like solving the problem