There have been some reports of some people having issues with the new MacBook Pro either crackling when outputting audio through the speakers, or kernel panicking — crashing the computer — when bridgeOS, the system that runs the Touch Bar, goes down.
macOS High Sierra 10.13.6 Supplemental Update 2 is intended to help with those issues, along with general system stability and performance.
The 1.3GB update hasn't been available long enough yet for any conclusive evidence from affected users, with mixed reports across the Apple Support Communities, Reddit, and our own MacRumors discussion forums.
Joe Rossignol does a great job rounding up a bunch of different results to date.
My understanding is that Supplemental Update 2 improves a number of issues, including the speakers and the kernel panic. That means some people may no longer experience them, and others may simply experience them less frequently, or see no change at all.
(I'm ok with this — better to have what improvements are ready now than to make everyone wait for more improvements to come... as long as those more improvements come asap, of course.)
If you've been having either of those issues with the new MacBook Pro on macOS High Sierra, let me know how the update works for you.
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