AFAIK, 44.1kHz is already x2. Meaning if you divide by 2 = 22.05kHz which is slightly beyond the human hearing range. Anything above cannot be heard unless you are a dog or something.

There is no such thing as 384kHz music
I use PowerAmp app on my phone. It plays 1000+ kbps music.



I doubt buying all those fancy gadgets will make it sound any better.
Why not try this blind test before buying?
https://www.npr.org/sections/therecord/2015...r-audio-quality
If you cannot tell the difference, then just skip it.
128kbps and 320kbps can tell if you use a good headphone.
If you use crap, you get crap anyway.

Anything beyond 320kbps is likely just placebo unless you have really good ears or a musician.
I have a music that's 24 bit, 48kHZ 1747 kbps flac. There's probably a very very small difference but I doubt the difference is worth the larger music file.

Video of a blind test if you're interested.