How do you listen to audio files?

[SeanColin]

’21 ST here. How do many of you play music through the system? Normally, I use a USB stick, but I tried using Poweramp to stream from my phone and noticed better separation in the way the music sounded(if that makes any sense). I’m no audiophile, I don’t want to modify the physical system, I’m curious if there’s a way to reprocess the files or some other trick to improve the sound quality. On an aside, the best stock system I’ve ever heard was in my mother's Acura RL. It was a Mark Levinson system with DVD audio, my god, did that sound good.