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HIFIMAN EF400 R2R DAC Headphone Amplifier All-in-one 3.5/4.4/6.35mm Full Balance USB Socket Earphone Output 116dB/4.4W*2
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Introducing the HIFIMAN EF400 Balanced Desktop DAC/Amplifier! | Headphone Reviews and Discussion - Head-Fi.org
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HIFIMAN EF400 Desktop R2R DAC and Headphone Amplifier Review - Packaging & Accessories | TechPowerUp
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