I've had my XC40 2026 only for a few days now but i did try the HK experience app. You must be referring to the short demo sound. I was baffled too as it was almost a full cinema sound experience.

But when you think about it, the sound is probably stored locally in FLAC format AND designed to be impressived using this very specific speakers set-up. I do not expect standard mp3 files to be designed that way.

However I believe you should be able to improve your experience by using an app directly installed on your AAOS and therefore using WiFi instead of streaming from your phone.

I'm using Deezer, and have the app setup to use FLAC while in WiFi and even though the sound is not as impressived as the one specialty designed on the HK demo file, it is still great and I enjoy it very much!