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What app/notification is causing this sound on my MacBook Pro Late 2011

My MacBook Pro running macOS 10.13.6 sporadically makes the following sound. I’d really like to know where this is coming from. Sometimes it looks like the computer makes the sound when the Ethernet cable and/or the power cable are disconnected, but I haven’t been able to reliably link the sound to any of these events as the sound is not played every time they happen. Even just being able to record the sound using my phone was lucky. Also, normally this sound is made a few times over the course of a few minutes and that has been happening once every day or two for the last week.

I have followed the suggestions in the answers here and here. As the sound is played infrequently, some of the solutions such as sudo fs_usage | grep "aiff" haven’t yet turned up any results.

I have looked at the Notification Center notifications and, although I have some from around the time this sound was played, none of those programs make this sound. I have also looked at the Notifications preference pane in Settings and no app in that list makes this sound (that I’m aware).

I’ve also searched the following locations for any .wav, .aif[f], .mp3 and .m4a file:

  • /Library
  • /System
  • /Applications
  • ~/Library

I played all the sounds I could find, but my search has come up empty. Naturally, the sound could be saved in another file format or be in another location…

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