Hi,
The issue can come from a high temperature under the speaker (CPU, GPU, battery charger input, etc.). This cause the treeble or the lowd diaphragm of the speaker (circular membrane) slightly melt away, soften and doesn't work properly anymore. Then the speaker cannot transmit correctly the sound. The solution is to replace the speaker (not very hard, tuto can be found on the internet, only need Philips screw driver) and to find why the temperature increases a lot. Sometimes fans must also be replaced if they show signs of ageing or simply cleaned by removing dust inside.
Hope it will help.
crwdns2934105:0crwdne2934105:0
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crwdns2944067:05crwdne2944067:0
I have the same problem, (I got the new replacement Pro only in 2019 Sept. just 7 months. now the guaranteed passed). I found the left speaker have bad sound, noisy and cracking. I called Apple, that cannot resolve my problem, due to COVID period, Apple stores are closed, and the authorized service provider did not answer the phone, and no way to left message. Finally I checked Sound from System Preferences and adjust the sound to right side, which sounds good, but now only one side works well, but at least it works!
crwdns2934271:0crwdnd2934271:0 Ching Grace crwdne2934271:0
@chingg - You have other options than Apple! If your upto it you could replace the speaker on your own. Or, you could find someone local who can help you.
Where do you live country and nearest city maybe we can aim you to someone!
crwdns2934271:0crwdnd2934271:0 DanJ crwdne2934271:0
@danj I have the same exact issue as the person you replied to right down to the same year model and down to the same side being affected. Muffled and crackled sounding with static. The thing is I did replace it myself with a replacement from iFixit and that did nothing, did not change it at all, and it's the same as before as with the new one in.
crwdns2934271:0crwdnd2934271:0 SeanErik crwdne2934271:0
@SeanErik - Check out the dialog in David Kirk answer below!
crwdns2934271:0crwdnd2934271:0 DanJ crwdne2934271:0
exact same problem. so lame. I did the fix you suggest and got the right side shut down. thanks~
crwdns2934271:0crwdnd2934271:0 Nick Hennen crwdne2934271:0