You are likely hearing one of the Signals
To understand which one, head to DRE -> Sound -> Signals to get an understanding, and try to disable the signals one-by-one until the Signal sound stops.
See which Signals are currently emitting sounds – 3 ways to get an overview:
- Hover the audio output level meter

- Go to
Sound -> Output -> Signals

- Check each setting and spot the Power-on icon (green circle with vertical line)

When you discover one you want to disable, use the search bar at the top to locate this Signal.


