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HIFIMAN EF400 Desktop Balanced Headphone DAC& Amplifier with Himalaya R2R DAC, 3.5 /4.4 /6.35mm Output for Home Audio - Price History
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HIFIMAN EF400 Desktop R2R DAC and Headphone Amplifier Review - Setup, Customization & Performance | TechPowerUp
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HIFIMAN'S EF400 Balanced Desktop DAC/Amplifier Epitomizes Performance and Flexibility in One Compact Chassis - HomeTheaterHifi.com
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