One of my speakers also has issues (not cracking in my case, more like weird resonance) so until I have time to take it in to Apple, my workaround is to pan the

One of my speakers also has issues (not cracking in my case, more like weird resonance) so until I have time to take it in to Apple, my workaround is to pan the sound over to the good side, in Sound Preferences. Not ideal but works okay for watching movies etc.