Another thing to add to the siblings pointing out that headphones/speakers make a bigger difference than AMPs/DACs/etc.: the room also makes an outsized differe

Another thing to add to the siblings pointing out that headphones/speakers make a bigger difference than AMPs/DACs/etc.: the room also makes an outsized difference in the case of speakers, even to untrained ears. So I'd say focus on headphones if you want to notice significant improvements.