I learned that from my father, who mostly listen to music from his phone using external headphone amp for his bayer dynamics studio headphones, or uses digital out (via Bluetooth) and let his other Bayern dynamics active headphones do the DAC. He is sure that he hears the difference, but of course that could all be in his head alone. I myself am not a hiFi enthusiast, I only find the tech behind it very interesting. (I listen to music using airPods and in my car using CarPlay, sorry iPhone user here, but thinking to migrate as soon as my iPhone X becomes unusable) But given my interest in tech, I appreciate the explanation, that cheap DAC chips are very good as well, these days.