I bought a lightning to 3.5mm adapter to use my sennheisers in my iPhone 12 but they sound so much better plugged straight into my old Samsung s9. I’m no expert so I don’t know how to explain the difference but sounds so much more crisp and can decipher all the different sounds on Samsung. Can I make them sound better through my iPhone?
You probably have some audio enhancements on in the background within Android. I noticed the same thing using a passthrough vs using a cheap crappy dac and it was because there were some android audio enhancements checked on by default.