I have a 15-inch MacBook Pro with Touch bar.
When I play loud music or watch a movie in which there's a noisy action scene for instance, the speakers' sound quality suddenly degrades. Sound continues to be played but as if there was no treble at all. The only "fix" I've found is to plug headphones, wait till the system output gets changed to the headphones, and plug them out again. This seems to reinit the built-in speakers to good, full-spectrum quality, but not for long — sound quickly degrades again under the same conditions.
Is there anything I can do about this?