Output source impedance measures 1Ω at 1,000 Hz, which is very low.
#Apple adapter plus
Here are some quick measurements of my iPhone 7 Plus made in my laboratory with a state-of-the-art Rohde & Schwarz UPL audio analyzer.
#Apple adapter pro
It's actually better than earlier iOS devices like the year-older iPad Pro and iPhone 6 Plus. Quite simply this microscopic adapter has the same superb audio quality of all my other iOS devices. These are measurements of the 3.5mm analog audio output of my A1749 adapter plugged into my iPhone 7 Plus playing signals in its Music app. I can plug the AirPort Express into my Benchmark DAC1 HDR, but I don't hear any difference. If you want the best quality for playback from iOS which also frees your iOS device from any cords, I use AirPlay to stream losslessly into an Airport Express and use the AirPort Express' analog output. No, you can't charge your phone while you're listening to headphones or the audio output in your Hi-Fi, but so what: you don't want to be plugged into the wall when you're trying to enjoy headphones, and running from battery power ensures you won't have any hum from ground loops with your home Hi-Fi - again far better than using an external plug-in-the-wall DAC. If you use this adapter with a device that has a headphone jack, you can only use one at a time. iOS 9 and before predate the headphone-jack-less iPhones, but if you have iOS 10 it works great on my old iPhone 5S - not that you'd need it to. You need iOS 10 for the adapter to work on older devices. It's essentially the same circuitry that used to be inside the phone. Apple has the resources to make this crazy little adapter state-of-the-art. Heck, most of today's audiophile and mainstream audio companies can't even afford the laboratory facilities I have. Pretty impressive, but you have to realize that Apple has a lot more smart people and the world's nest audio engineers that " audiophile" companies can't afford.
Yes, your remote control and microphone in your headphones will work exactly as they have on old iPhones.Īll this circuitry is hidden inside an adapter smaller than most passive adapters, and as you'll see, this invisible circuitry outperforms most external DACs and headphone amplifiers. For instance, it's so smart that it remembers different volume settings for my pro headphones that only have three terminals on their plugs versus my mobile headphones that have 4-terminal (TRRS) connectors with remote & mics. It's smart enough to respond to remote control commands and has circuitry to let it tell the phone what, or if, something is plugged in.
This tiny adapter houses a microscopic stereo digital-to-analog converter (DAC), a stereo headphone amplifier, a microphone preamplifier and monophonic analog-to-digital converter (ADC) and power converters to run this all. If you look under a microscope, it's actually marked "Model A1749" in white on white on the 1" (3cm) piece of flexible cable.Īpple knows what they're doing. It's only 3" (75mm) long and only weighs 0.085 oz. You can just leave this attached to any set of your favorite headphones or Hi-Fi cables extras sell for only $9 each. It provides a 3.5mm jack for your headphones or a jack to plug a cable into a conventional Hi-Fi. The iPhone 7 Plus and iPhone 7 have no headphone jack, but it includes - free - this model A1749 audio adapter that provides a 3.5mm analog line-level or headphone audio output from the phone's lightning connector.
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