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
Mac Pro (Late 2013): Audio ports - Audio Perception
Archimago's Musings: REVIEW: E1DA #9038D6K Dongle DAC / Headphone Amp (Part I) - PCM DAC performance. And (potentially) higher dynamic range in Spatial Audio 2-channel fold-downs.
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Amazon.com: AGPTEK® Hands-Free Call Center Noise Cancelling Corded Monaural Headset USB Headset with Microphone for PC Headphone with Mic Mircrophone - Cord with USB Plug, Volume Control : Electronics
Amazon.com: FiiO E9i Desktop Pre-Amp and Headphone Amplifier Dock for iPod and iPhone : Electronics
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