An internal memo shared with Apple Authorized Service Providers reads:
If a customer hears a popping sound when playback is stopped on their MacBook Pro (16-inch, 2019)
When using Final Cut Pro X, Logic Pro X, QuickTime Player, Music, Movies, or other applications to play audio, users may hear a pop come from the speakers after playback has ended. Apple is investigating the issue. A fix is planned in future software updates. Do not set up service, or replace the user's computer, as this is a software-related issue.
Apple seeded macOS Catalina 10.15.2 beta 4 to developers today. It's unclear if the new beta contains a fix but let us know in the comments if you notice an improvement.
You can download the iClarified app or follow iClarified on Twitter, Facebook, YouTube, and RSS for updates.
If you're interested in purchasing the new 16-inch MacBook Pro, the i7 512GB model is currently on sale for $159.06 off and the i9 1TB model is on sale for $204 off.