Question Macbook Pro speaker problem --again ?

[tomboing]

My last Macbook Pro 15 inch 2010 model had to be put to sleep as the speakers volume became very low and did not improve despite doind everything short of replacement. Also it kept restarting randomly due to a hardware bug. Another Macbook Pro 15 inch (2015) also developed speaker issues (crackling, tinny buzzing sound) despite being used very sparingly.

The OS is High Sierra. To eliminate the possibility of a software bug, I tried to update to Monterey but no update is showing in the app store except Sonoma which is not compatible with the 2015 Macbook Pro.
What should I do to access the MacOS Monterey ?

 

[Phillip Corcoran]

Go here: https://www.apple.com/by/macos/monterey/

 

[tomboing]

Go here: https://www.apple.com/by/macos/monterey/

Thanks! The update was successful but the speakers issue was not resolved. Both the speakers are sounding crackling and tinny with buzzing. Any suggestions for remedial action? I can't think of a reason why it is happening. The MacBook was kept safely in a cupboard for the last 4 years without use.

 

[Phillip Corcoran]

Sorry, I'm unable to help you with the speaker issue.