I find it interesting that some people think the APP2 (or most other TWS for that matter) were/are very effective with regard to higher frequency attenuation. They’re not. And they haven’t been even before the „evil“ new firmware update.
As we can clearly see in the Soundguys ANC measurement of the old firmware, the best attenuation was between 0hz and roughly 4khz.
Everything above that, the ANC cut less than the passive isolation already did. Which is pretty normal for ANC in TWS btw. You can see that green line doesn’t ever go higher than the pink one after 4khz basically.
This means that even on the previous firmware, everything above 4khz was attenuated by passive isolation (aka seal) more than anything else and not really by the ANC.
So, long story short, people need to stop that the previous firmware cut out „everything“, even „higher pitched sounds“ while the new one doesn’t. It’s just nonsense. See the chart on that in the picture here.
Some anecdotal evidence at the end:
I was watching TV last evening testing out the ANC of the Sennheiser Momentum True Wireless 3 vs. the Apple AirPods Pro 2 and while the MTW3 have the way better passive isolation when all ANC is off, when ANC is activated I felt that the APP2 were better all things considered. I was still able to hear some of what the voices were saying on both sets but less so on the APP2.
This means two things:
1. The APP2 (still) have way better ANC than the MTW3 and
2. I could still hear some of the voices for the reasons just explained (and shown on the Soundguys measurement).