“Few people realize that Apple iOS devices have some of the best audio digital-to-analog converters and low-impedance headphone amplifiers available at any price.”
Either we’re all delusional and should be trading in our streamer/players for an iPad . . . or he’s exaggerating.
It’s certainly worth taking a serious look at the measurements Mr. Rockwell has published.
Little to argue with there.
I can confirm that with extensive A/B testing it’s entirely feasible to enjoy CD quality sound from both Airport2 , optical feed to a DAC or hardwiring via the 30-pin & RCA/DIN cabling.