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H1 Portable Mini Headphone Amplifier 3.5mm Stereo Audio HiFi Ear Amp Support Impedance 16-300 Headset for MP3/MP4 /Phones/Digital Players/Tablets/Computers - Newegg.com
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What's the loudest MP3 player I can get (born hard in hearing so I don't need the lecture of ear damage, certain headphones, etc.)? - Quora
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