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iPhone 6s - Technical Specifications - Apple
https://support.apple.com/kb/SP726?locale=en_US
3.5 mm headphone jack; Lightning connector; Microphones; Built-in speaker; Power and Battery 6. Talk time: Up to 14 hours on 3G; Internet use: Up to 10 hours on 3G, up to 10 hours on LTE, up to 11 hours on Wi-Fi; HD video …
iPhone 5 - Technical Specifications - Apple
https://support.apple.com/kb/SP655?locale=en_US
Video formats supported: H.264 video up to 1080p, 30 frames per second, High Profile level 4.1 with AAC-LC audio up to 160 Kbps, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats; MPEG-4 video up to 2.5 Mbps, 640 by 480 pixels, 30 frames per second, Simple Profile with AAC-LC audio up to 160 Kbps per channel, 48kHz, stereo audio in .m4v, .mp4, and …
Apple Lightning Adapter Audio Quality Measurements
https://www.kenrockwell.com/apple/lightning-adapter-audio-quality.htm
It provides a 3.5mm jack for your headphones or a jack to plug a cable into a conventional Hi-Fi. You can just leave this attached to any set of your favorite headphones or Hi-Fi cables; extras sell for only $9 each. Go crazy. It's only 3" (75mm) long and only weighs 0.085 oz. (2.4g).
Lightning to 3.5 mm Headphone Jack Adapter - Apple
https://www.apple.com/shop/product/MMX62AM/A/lightning-to-35-mm-headphone-jack-adapter
Lightning to 3.5 mm Headphone Jack Adapter System Requirements Works with all devices that have a Lightning connector and support iOS 10 or later, including iPod touch, iPad, and iPhone. Compatibility Recommended Lightning to 3.5 mm Audio Cable (1.2m) - White $35.00 USB-C to 3.5 mm Headphone Jack Adapter $9.00
iPhone 12 and iPhone 12 mini - Technical Specifications ...
https://www.apple.com/iphone-12/specs/
Audio formats supported: AAC‑LC, HE‑AAC, HE‑AAC v2, Protected AAC, MP3, Linear PCM, Apple Lossless, FLAC, Dolby Digital (AC‑3), Dolby Digital Plus (E‑AC‑3), Dolby Atmos, and Audible (formats 2, 3, 4, Audible Enhanced Audio, AAX, and AAX+)
What is the voltage range of a standard headphone jack ...
https://electronics.stackexchange.com/questions/28404/what-is-the-voltage-range-of-a-standard-headphone-jack-from-a-phone
While "line level" audio is typically 1 mW into 600 Ω, and this comes out to 1.1 V p for a sine, audio is far from a sine. Even if the spec is adhered to and you only get 775 mV RMS on average, the peaks can be considerably higher than 1.1 V. It is generally good to accept and handle without distortion peaks up to ± 5 V at least. Share
Has Apple made any improvement on the DAC? - Apple Community
https://discussions.apple.com/thread/250696912
The Audio output of the many years old iphone 6S plus is better then all iphones with no headphone jack,SPECIALLY the loudness leval and the bass quality.No doubt iphone speakers improved every year but they are missing big time on the DAC.
what's the iPhone 3.5 mm output jack power supply ... - …
https://www.ifixit.com/Answers/View/97418/what's+the+iPhone+3.5+mm+output+jack+power+supply+output
The audio jack is actually a 4-pin connector. The additional pin is for the mic input. 1 Tip Left audio 2 Ring Right audio 3 Ring Common/Ground 4 Sleeve Microphone Since the iPods have some 60mw output (30mw per channel) I would put the iPhone into that range. Here is some other audio data comparisons:
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