Mac Pro (Late 2013): External features, ports, and connectors - Audio Perception
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impedance - Electronic aspects of iPhone 3.5mm audio output - Electrical Engineering Stack Exchange
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Amazon.com: 2 Pack 3.5mm Wired Headphone Plug, in-Ear Earphones, Earbuds Noise Isolating with Built-in Microphone & Volume Control Compatible with iPhone 6s 6 Plus 5s 5 iPad iPod MP3 MP4 Samsung Android
Apple Provides Details on Using High-Impedance Headphones With New MacBook Pros | MacRumors Forums
7 Best Fixes for Headphone Jack Not Working on Mac - Guiding Tech
ASUS Launches Xonar Essence STU USB DAC
Headphones - Wikipedia
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Identify the ports on your Mac - Apple Support
Archimago's Musings: MEASUREMENTS: Audioengine D3 USB DAC / Headphone Amp Reviewed.
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High Impedance Headphone Test | M1 Pro/Max MacBook Pro 2021 - YouTube
The Headphone Port: The Mac's Achilles Heel - TidBITS
