The sound and screen are most likely normal. The screen has a poor response time which leads to tearing on certain images like text negating the Promotion to some degree.
However what you are describing with the UFO test just means you are using an App or browser that is not supported with Pro-Motion yet. I am sure as Apple releases more updates that issue will be resolved if it hasn't already.
As for the sound it is normal although the 16" has louder and larger speakers than the 14" I experienced issues with certain content specially voices. The sound is super rich and has a lot of bass but the higher end is a bit lacking. I never had a problem that turning the volume up couldn't fix on the 16" but the 14" was a problem and I returned it because of the lack of volume. I literally could not hear content like voices even with the volume all the way up and that was a huge problem. When I got the 16" it was loud enough. So I am surprised you have experienced this on the 16"?
I actually prefer the sound on the M2 MBA even though it lacks the bass of the Pro's I find it much clearer and still has a great sound stage and some bass.
However what you are describing with the UFO test just means you are using an App or browser that is not supported with Pro-Motion yet. I am sure as Apple releases more updates that issue will be resolved if it hasn't already.
As for the sound it is normal although the 16" has louder and larger speakers than the 14" I experienced issues with certain content specially voices. The sound is super rich and has a lot of bass but the higher end is a bit lacking. I never had a problem that turning the volume up couldn't fix on the 16" but the 14" was a problem and I returned it because of the lack of volume. I literally could not hear content like voices even with the volume all the way up and that was a huge problem. When I got the 16" it was loud enough. So I am surprised you have experienced this on the 16"?
I actually prefer the sound on the M2 MBA even though it lacks the bass of the Pro's I find it much clearer and still has a great sound stage and some bass.