Soundcore pro 2 High Frequency Issue ?

So is anyone else experiencing Hissing when trying to play high-frequency sound on their pro 2s ? i used a frequency generator site and once it reaches around 8khz and above it starts hissing or becoming very unpure, this issue seems to be almost fixed for me when i switch from apt-x to aac on my android. does anyone else have this issue or is it just my unit

I can not hear that 8000hz, I am wondering who can!
Me an old man I can hear up to 6000hz.
But I know I have some hearing problems.
(drummer on stage in my youth)

I am with you @Chiquinho.

Soundcore had a thread where they had a sound test to see what was the highest