Quoting from the article I linked you: >>Analysis & Recommendations >>As expected, the analog audio output of the iPhone 6S Plus is extraordinarily good. It ha

Quoting from the article I linked you: >>Analysis & Recommendations >>As expected, the analog audio output of the iPhone 6S Plus is extraordinarily good. It has only >>half the distortion of the already extraordinary iPhone 6 Plus. >>Apple has more smart people and more resources than any other audio company on the planet, so as >>we see when it comes to audio engineering, the iPhone easily outdoes many so-called "audiophile" >>products. >>For enjoying music, you will probably get poorer performance if you waste your time and money >>with outboard DACs or headphone amplifiers; the iPhone already has the best there is.