Replace the logic board Distorted sound from speaker
Note: MacBook Air has a mono speaker. Its slim enclosure also does not have any speaker grilles. Because of this configuration, sound reverberates inside the enclosure and may be distorted at high volumes. If sound isn't distorted at normal volumes, there may not be a hardware failure.
- Compare the same sound and same settings with two different units to make sure that sound is actually distorted. If abnormal, replace the speaker assembly.
- Check the speaker cable. If damaged, replace the speaker assembly.
- Replace the logic board.
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