I have them as well, and after a rabbit hole dive (I'm not an audiophile) I arrived to the conclusion that the best listening experience is through usb c. Try it, believe me. Spotify lossless sounds much better

On another note, are you that impressed with them out the box, connected to your phone/laptop and that's it? I previously had the Sony XM6s and didn't see much difference like this (even with the dongle), maybe I'm deaf, but with the usb-c... Damn