https://youtu.be/6TWJaFD6R2s?feature=shared
You can check your Headphones (Kopfhörer) or your speakers (Lautsprecher). This ist thought of being useful for 2.0 or 2.1.You can find other Sound Tests in ...
Hahhaaahahaha.
I've used this for years to test speakers and headphones etc, and had never read any of the comments!
They're great! But you can feel the disappointment dripping off some of the comments, that made me a bit sad 😔
The bottom speaker on my phone is Right and the top speaker is Left. I definitively know which rotation direction is the correct one now.
Neat!