I've seen some assert that they just use some of the extra pins to pass normal audio. The adaptor is entirely dumb. And that you might get some extra noise beca

I've seen some assert that they just use some of the extra pins to pass normal audio. The adaptor is entirely dumb. And that you might get some extra noise because now your headphone jack is also a high-speed digital connection.. Someone might make "active" headphones with their own DAC, but disregarding those noise-cancelling cans that so many people seem enamored with, that's going to venture into audiophile nonsense very quickly.