In a memo to authorized service providers, obtained by MacRumors, Apple acknowledges that customers may find themselves facing speaker issues with the company’s $1599 display. Apple says that customers facing issues should unplug the Studio Display from power, unplug any accessories or devices connected to the display, wait ten seconds, then reconnect the Studio Display to power. Apple explicitly notes this is not a hardware problem and implies that a future iOS update may address the issues.
Just think about how much easier this process would be if you could take the power cable out of the back of the display itself.
Update: There’s a firmware update out to address the issues.