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The Headphone Port: The Mac's Achilles Heel - TidBITS
Apple Provides Details on Using High-Impedance Headphones With New MacBook Pros | MacRumors Forums
Mac Pro (Late 2013): Audio ports - Audio Perception
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iMacs have built in 24bit/96khz DAC?!? | MacRumors Forums
Apple Explains High Impedance Headphone Tech On New MacBook Pro | Production Expert
New CPUs, faster Wi-Fi, same flaws: Apple's 2013 iMac reviewed | Ars Technica